- Adds Basic Support for Communities (172)

- Adds Community discovery screens
- Adds Public Chat discovery
- Adds Community Follow/Unfollow
- Renders Community Posts in feed
- Creates a summary of verified participants in Communities/Chats/Streams
- Restructures Hashtag Screen to the new Screen Building structure
- Remembers scroll position in Live, Community and Chat discovery

app/src/main/java/com/vitorpamplona/amethyst/LocalPreferences.kt

@@ -43,6 +43,7 @@ private object PrefKeys {
     const val NOSTR_PRIVKEY = "nostr_privkey"
     const val NOSTR_PUBKEY = "nostr_pubkey"
     const val FOLLOWING_CHANNELS = "following_channels"
+    const val FOLLOWING_COMMUNITIES = "following_communities"
     const val HIDDEN_USERS = "hidden_users"
     const val RELAYS = "relays"
     const val DONT_TRANSLATE_FROM = "dontTranslateFrom"
@@ -205,6 +206,7 @@ object LocalPreferences {
             account.loggedIn.privKey?.let { putString(PrefKeys.NOSTR_PRIVKEY, it.toHex()) }
             account.loggedIn.pubKey.let { putString(PrefKeys.NOSTR_PUBKEY, it.toHex()) }
             putStringSet(PrefKeys.FOLLOWING_CHANNELS, account.followingChannels)
+            putStringSet(PrefKeys.FOLLOWING_COMMUNITIES, account.followingCommunities)
             putStringSet(PrefKeys.HIDDEN_USERS, account.hiddenUsers)
             putString(PrefKeys.RELAYS, gson.toJson(account.localRelays))
             putStringSet(PrefKeys.DONT_TRANSLATE_FROM, account.dontTranslateFrom)
@@ -247,6 +249,7 @@ object LocalPreferences {
             val pubKey = getString(PrefKeys.NOSTR_PUBKEY, null) ?: return null
             val privKey = getString(PrefKeys.NOSTR_PRIVKEY, null)
             val followingChannels = getStringSet(PrefKeys.FOLLOWING_CHANNELS, null) ?: setOf()
+            val followingCommunities = getStringSet(PrefKeys.FOLLOWING_COMMUNITIES, null) ?: setOf()
             val hiddenUsers = getStringSet(PrefKeys.HIDDEN_USERS, emptySet()) ?: setOf()
             val localRelays = gson.fromJson(
                 getString(PrefKeys.RELAYS, "[]"),
@@ -340,6 +343,7 @@ object LocalPreferences {
             val a = Account(
                 loggedIn = Persona(privKey = privKey?.hexToByteArray(), pubKey = pubKey.hexToByteArray()),
                 followingChannels = followingChannels,
+                followingCommunities = followingCommunities,
                 hiddenUsers = hiddenUsers,
                 localRelays = localRelays,
                 dontTranslateFrom = dontTranslateFrom,

app/src/main/java/com/vitorpamplona/amethyst/ServiceManager.kt

@@ -74,6 +74,7 @@ object ServiceManager {
             NostrHomeDataSource.start()
             NostrAccountDataSource.start()
             NostrChatroomListDataSource.start()
+            NostrDiscoveryDataSource.start()
 
             // More Info Data Sources
             NostrSingleEventDataSource.start()

app/src/main/java/com/vitorpamplona/amethyst/model/Account.kt

@@ -50,6 +50,7 @@ val KIND3_FOLLOWS = " All Follows "
 class Account(
     val loggedIn: Persona,
     var followingChannels: Set<String> = DefaultChannels,
+    var followingCommunities: Set<String> = setOf(),
     var hiddenUsers: Set<String> = setOf(),
     var localRelays: Set<RelaySetupInfo> = Constants.defaultRelays.toSet(),
     var dontTranslateFrom: Set<String> = getLanguagesSpokenByUser(),
@@ -107,6 +108,10 @@ class Account(
         return followingChannels.mapNotNull { LocalCache.checkGetOrCreateChannel(it) }
     }
 
+    fun followingCommunities(): List<AddressableNote> {
+        return followingCommunities.mapNotNull { LocalCache.checkGetOrCreateAddressableNote(it) }
+    }
+
     fun isWriteable(): Boolean {
         return loggedIn.privKey != null
     }
@@ -857,6 +862,20 @@ class Account(
         saveable.invalidateData()
     }
 
+    fun joinCommunity(idHex: String) {
+        followingCommunities = followingCommunities + idHex
+        live.invalidateData()
+
+        saveable.invalidateData()
+    }
+
+    fun leaveCommunity(idHex: String) {
+        followingCommunities = followingCommunities - idHex
+        live.invalidateData()
+
+        saveable.invalidateData()
+    }
+
     fun hideUser(pubkeyHex: String) {
         hiddenUsers = hiddenUsers + pubkeyHex
         live.invalidateData()
@@ -1153,6 +1172,10 @@ class Account(
         return user.pubkeyHex in followingKeySet()
     }
 
+    fun isFollowing(user: HexKey): Boolean {
+        return user in followingKeySet()
+    }
+
     fun isAcceptable(note: Note): Boolean {
         return note.author?.let { isAcceptable(it) } ?: true && // if user hasn't hided this author
             isAcceptableDirect(note) &&

app/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt

@@ -55,6 +55,10 @@ object LocalCache {
         return users.get(key)
     }
 
+    fun getAddressableNoteIfExists(key: String): AddressableNote? {
+        return addressables[key]
+    }
+
     fun getNoteIfExists(key: String): Note? {
         return addressables[key] ?: notes[key]
     }
@@ -681,16 +685,20 @@ object LocalCache {
         // Log.d("TN", "New Boost (${notes.size},${users.size}) ${note.author?.toBestDisplayName()} ${formattedDateTime(event.createdAt)}")
 
         val author = getOrCreateUser(event.pubKey)
-        val repliesTo = event.taggedAddresses().map { getOrCreateAddressableNote(it) }
 
-        note.loadEvent(event, author, repliesTo)
+        val communities = event.communities()
+        val eventsApproved = event.approvedEvents().mapNotNull { checkGetOrCreateNote(it) }
+
+        val repliesTo = communities.map { getOrCreateAddressableNote(it) }
+
+        note.loadEvent(event, author, eventsApproved)
 
         // Prepares user's profile view.
         author.addNote(note)
 
         // Counts the replies
         repliesTo.forEach {
-            it.addReply(note)
+            it.addBoost(note)
         }
 
         refreshObservers(note)
@@ -1181,7 +1189,7 @@ object LocalCache {
                 }
             }
 
-            println("PRUNE: ${toBeRemoved.size} messages removed from ${it.value.toBestDisplayName()}")
+            println("PRUNE: ${toBeRemoved.size} messages removed from ${it.value.toBestDisplayName()}. ${it.value.notes.size} kept")
         }
     }
 

app/src/main/java/com/vitorpamplona/amethyst/model/Note.kt

@@ -279,20 +279,55 @@ open class Note(val idHex: String) {
         }
     }
 
-    fun publicZapAuthors(): Set<HexKey> {
+    fun publicZapAuthors(): Set<User> {
+        // Zaps who the requester was the user
+        return zaps.mapNotNull {
+            it.key.author
+        }.toSet()
+    }
+
+    fun publicZapAuthorHexes(): Set<HexKey> {
         // Zaps who the requester was the user
         return zaps.mapNotNull {
             it.key.author?.pubkeyHex
         }.toSet()
     }
 
-    fun reactionAuthors(): Set<HexKey> {
+    fun reactionAuthors(): Set<User> {
+        // Zaps who the requester was the user
+        return reactions.values.map {
+            it.mapNotNull { it.author }
+        }.flatten().toSet()
+    }
+
+    fun reactionAuthorHexes(): Set<HexKey> {
         // Zaps who the requester was the user
         return reactions.values.map {
             it.mapNotNull { it.author?.pubkeyHex }
         }.flatten().toSet()
     }
 
+    fun replyAuthorHexes(): Set<HexKey> {
+        // Zaps who the requester was the user
+        return replies.mapNotNull {
+            it.author?.pubkeyHex
+        }.toSet()
+    }
+
+    fun replyAuthors(): Set<User> {
+        // Zaps who the requester was the user
+        return replies.mapNotNull {
+            it.author
+        }.toSet()
+    }
+
+    fun boostAuthors(): Set<User> {
+        // Zaps who the requester was the user
+        return boosts.mapNotNull {
+            it.author
+        }.toSet()
+    }
+
     fun isReactedBy(user: User): String? {
         return reactions.filter {
             it.value.any { it.author?.pubkeyHex == user.pubkeyHex }

app/src/main/java/com/vitorpamplona/amethyst/model/ParticipantListBuilder.kt

@@ -0,0 +1,69 @@
+package com.vitorpamplona.amethyst.model
+
+class ParticipantListBuilder {
+    private fun addFollowsThatDirectlyParticipateOnToSet(baseNote: Note, followingSet: Set<HexKey>?, set: MutableSet<User>) {
+        baseNote.author?.let { author ->
+            if (author !in set && (followingSet == null || author.pubkeyHex in followingSet)) set.add(author)
+        }
+
+        // Breaks these searchers down to avoid the memory use of creating multiple lists
+        baseNote.replies.forEach { reply ->
+            reply.author?.let { author ->
+                if (author !in set && (followingSet == null || author.pubkeyHex in followingSet)) set.add(author)
+            }
+        }
+
+        baseNote.boosts.forEach { boost ->
+            boost.author?.let { author ->
+                if (author !in set && (followingSet == null || author.pubkeyHex in followingSet)) set.add(author)
+            }
+        }
+
+        baseNote.zaps.forEach { zapPair ->
+            zapPair.key.author?.let { author ->
+                if (author !in set && (followingSet == null || author.pubkeyHex in followingSet)) set.add(author)
+            }
+        }
+
+        baseNote.reactions.forEach { reactionSet ->
+            reactionSet.value.forEach { reaction ->
+                reaction.author?.let { author ->
+                    if (author !in set && (followingSet == null || author.pubkeyHex in followingSet)) set.add(author)
+                }
+            }
+        }
+    }
+
+    fun followsThatParticipateOnDirect(baseNote: Note?, followingSet: Set<HexKey>?): Set<User> {
+        if (baseNote == null) return mutableSetOf()
+
+        val set = mutableSetOf<User>()
+        addFollowsThatDirectlyParticipateOnToSet(baseNote, followingSet, set)
+        return set
+    }
+
+    fun followsThatParticipateOn(baseNote: Note?, followingSet: Set<HexKey>?): Set<User> {
+        if (baseNote == null) return mutableSetOf()
+
+        val mySet = mutableSetOf<User>()
+        addFollowsThatDirectlyParticipateOnToSet(baseNote, followingSet, mySet)
+
+        baseNote.replies.forEach {
+            addFollowsThatDirectlyParticipateOnToSet(it, followingSet, mySet)
+        }
+
+        LocalCache.getChannelIfExists(baseNote.idHex)?.notes?.values?.forEach {
+            addFollowsThatDirectlyParticipateOnToSet(it, followingSet, mySet)
+        }
+
+        return mySet
+    }
+
+    fun countFollowsThatParticipateOn(baseNote: Note?, followingSet: Set<HexKey>?): Int {
+        if (baseNote == null) return 0
+
+        val list = followsThatParticipateOn(baseNote, followingSet)
+
+        return list.size
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/NostrCommunityDataSource.kt

@@ -0,0 +1,41 @@
+package com.vitorpamplona.amethyst.service
+
+import com.vitorpamplona.amethyst.model.AddressableNote
+import com.vitorpamplona.amethyst.service.model.CommunityDefinitionEvent
+import com.vitorpamplona.amethyst.service.model.CommunityPostApprovalEvent
+import com.vitorpamplona.amethyst.service.relays.COMMON_FEED_TYPES
+import com.vitorpamplona.amethyst.service.relays.JsonFilter
+import com.vitorpamplona.amethyst.service.relays.TypedFilter
+
+object NostrCommunityDataSource : NostrDataSource("SingleCommunityFeed") {
+    private var communityToWatch: AddressableNote? = null
+
+    private fun createLoadCommunityFilter(): TypedFilter? {
+        val myCommunityToWatch = communityToWatch ?: return null
+
+        val community = myCommunityToWatch.event as? CommunityDefinitionEvent ?: return null
+
+        return TypedFilter(
+            types = COMMON_FEED_TYPES,
+            filter = JsonFilter(
+                authors = community.moderators().map { it.key }.plus(listOfNotNull(myCommunityToWatch.author?.pubkeyHex)),
+                tags = mapOf(
+                    "a" to listOf(myCommunityToWatch.address.toTag())
+                ),
+                kinds = listOf(CommunityPostApprovalEvent.kind),
+                limit = 500
+            )
+        )
+    }
+
+    val loadCommunityChannel = requestNewChannel()
+
+    override fun updateChannelFilters() {
+        loadCommunityChannel.typedFilters = listOfNotNull(createLoadCommunityFilter()).ifEmpty { null }
+    }
+
+    fun loadCommunity(note: AddressableNote?) {
+        communityToWatch = note
+        invalidateFilters()
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/NostrDiscoveryDataSource.kt

@@ -4,6 +4,8 @@ import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
 import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
 import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
+import com.vitorpamplona.amethyst.service.model.CommunityDefinitionEvent
+import com.vitorpamplona.amethyst.service.model.CommunityPostApprovalEvent
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesChatMessageEvent
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent
 import com.vitorpamplona.amethyst.service.relays.FeedType
@@ -13,7 +15,7 @@ import com.vitorpamplona.amethyst.service.relays.TypedFilter
 object NostrDiscoveryDataSource : NostrDataSource("DiscoveryFeed") {
     lateinit var account: Account
 
-    fun createContextualFilter(): TypedFilter {
+    fun createLiveStreamFilter(): TypedFilter {
         val follows = account.selectedUsersFollowList(account.defaultDiscoveryFollowList)
 
         val followKeys = follows?.map {
@@ -24,13 +26,47 @@ object NostrDiscoveryDataSource : NostrDataSource("DiscoveryFeed") {
             types = setOf(FeedType.GLOBAL),
             filter = JsonFilter(
                 authors = followKeys,
-                kinds = listOf(ChannelCreateEvent.kind, ChannelMetadataEvent.kind, ChannelMessageEvent.kind, LiveActivitiesChatMessageEvent.kind, LiveActivitiesEvent.kind),
-                limit = 1000
+                kinds = listOf(LiveActivitiesChatMessageEvent.kind, LiveActivitiesEvent.kind),
+                limit = 500
             )
         )
     }
 
-    fun createFollowTagsFilter(): TypedFilter? {
+    fun createPublicChatFilter(): TypedFilter {
+        val follows = account.selectedUsersFollowList(account.defaultDiscoveryFollowList)
+
+        val followKeys = follows?.map {
+            it.substring(0, 6)
+        }
+
+        return TypedFilter(
+            types = setOf(FeedType.GLOBAL),
+            filter = JsonFilter(
+                authors = followKeys,
+                kinds = listOf(ChannelCreateEvent.kind, ChannelMetadataEvent.kind, ChannelMessageEvent.kind),
+                limit = 500
+            )
+        )
+    }
+
+    fun createCommunitiesFilter(): TypedFilter {
+        val follows = account.selectedUsersFollowList(account.defaultDiscoveryFollowList)
+
+        val followKeys = follows?.map {
+            it.substring(0, 6)
+        }
+
+        return TypedFilter(
+            types = setOf(FeedType.GLOBAL),
+            filter = JsonFilter(
+                authors = followKeys,
+                kinds = listOf(CommunityDefinitionEvent.kind, CommunityPostApprovalEvent.kind),
+                limit = 500
+            )
+        )
+    }
+
+    fun createLiveStreamTagsFilter(): TypedFilter? {
         val hashToLoad = account.selectedTagsFollowList(account.defaultDiscoveryFollowList)
 
         if (hashToLoad.isNullOrEmpty()) return null
@@ -38,13 +74,51 @@ object NostrDiscoveryDataSource : NostrDataSource("DiscoveryFeed") {
         return TypedFilter(
             types = setOf(FeedType.GLOBAL),
             filter = JsonFilter(
-                kinds = listOf(ChannelCreateEvent.kind, ChannelMetadataEvent.kind, ChannelMessageEvent.kind, LiveActivitiesChatMessageEvent.kind, LiveActivitiesEvent.kind),
+                kinds = listOf(LiveActivitiesChatMessageEvent.kind, LiveActivitiesEvent.kind),
                 tags = mapOf(
                     "t" to hashToLoad.map {
                         listOf(it, it.lowercase(), it.uppercase(), it.capitalize())
                     }.flatten()
                 ),
-                limit = 1000
+                limit = 500
+            )
+        )
+    }
+
+    fun createPublicChatsTagsFilter(): TypedFilter? {
+        val hashToLoad = account.selectedTagsFollowList(account.defaultDiscoveryFollowList)
+
+        if (hashToLoad.isNullOrEmpty()) return null
+
+        return TypedFilter(
+            types = setOf(FeedType.GLOBAL),
+            filter = JsonFilter(
+                kinds = listOf(ChannelCreateEvent.kind, ChannelMetadataEvent.kind, ChannelMessageEvent.kind),
+                tags = mapOf(
+                    "t" to hashToLoad.map {
+                        listOf(it, it.lowercase(), it.uppercase(), it.capitalize())
+                    }.flatten()
+                ),
+                limit = 500
+            )
+        )
+    }
+
+    fun createCommunitiesTagsFilter(): TypedFilter? {
+        val hashToLoad = account.selectedTagsFollowList(account.defaultDiscoveryFollowList)
+
+        if (hashToLoad.isNullOrEmpty()) return null
+
+        return TypedFilter(
+            types = setOf(FeedType.GLOBAL),
+            filter = JsonFilter(
+                kinds = listOf(CommunityDefinitionEvent.kind, CommunityPostApprovalEvent.kind),
+                tags = mapOf(
+                    "t" to hashToLoad.map {
+                        listOf(it, it.lowercase(), it.uppercase(), it.capitalize())
+                    }.flatten()
+                ),
+                limit = 500
             )
         )
     }
@@ -52,6 +126,13 @@ object NostrDiscoveryDataSource : NostrDataSource("DiscoveryFeed") {
     val discoveryFeedChannel = requestNewChannel()
 
     override fun updateChannelFilters() {
-        discoveryFeedChannel.typedFilters = listOfNotNull(createContextualFilter(), createFollowTagsFilter()).ifEmpty { null }
+        discoveryFeedChannel.typedFilters = listOfNotNull(
+            createLiveStreamFilter(),
+            createPublicChatFilter(),
+            createCommunitiesFilter(),
+            createLiveStreamTagsFilter(),
+            createPublicChatsTagsFilter(),
+            createCommunitiesTagsFilter()
+        ).ifEmpty { null }
     }
 }

app/src/main/java/com/vitorpamplona/amethyst/service/model/BaseTextNoteEvent.kt

@@ -113,7 +113,7 @@ open class BaseTextNoteEvent(
 
     fun tagsWithoutCitations(): List<String> {
         val repliesTo = replyTos()
-        val tagAddresses = taggedAddresses().map { it.toTag() }
+        val tagAddresses = taggedAddresses().filter { it.kind != CommunityDefinitionEvent.kind }.map { it.toTag() }
         if (repliesTo.isEmpty() && tagAddresses.isEmpty()) return emptyList()
 
         val citations = findCitations()

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelHideMessageEvent.kt

@@ -14,7 +14,13 @@ class ChannelHideMessageEvent(
     tags: List<List<String>>,
     content: String,
     sig: HexKey
-) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
+) : Event(id, pubKey, createdAt, kind, tags, content, sig), IsInPublicChatChannel {
+    override fun channel() = tags.firstOrNull {
+        it.size > 3 && it[0] == "e" && it[3] == "root"
+    }?.get(1) ?: tags.firstOrNull {
+        it.size > 1 && it[0] == "e"
+    }?.get(1)
+
     fun eventsToHide() = tags.filter { it.firstOrNull() == "e" }.mapNotNull { it.getOrNull(1) }
 
     companion object {

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelMessageEvent.kt

@@ -14,9 +14,9 @@ class ChannelMessageEvent(
     tags: List<List<String>>,
     content: String,
     sig: HexKey
-) : BaseTextNoteEvent(id, pubKey, createdAt, kind, tags, content, sig) {
+) : BaseTextNoteEvent(id, pubKey, createdAt, kind, tags, content, sig), IsInPublicChatChannel {
 
-    fun channel() = tags.firstOrNull {
+    override fun channel() = tags.firstOrNull {
         it.size > 3 && it[0] == "e" && it[3] == "root"
     }?.get(1) ?: tags.firstOrNull {
         it.size > 1 && it[0] == "e"
@@ -65,3 +65,7 @@ class ChannelMessageEvent(
         }
     }
 }
+
+interface IsInPublicChatChannel {
+    open fun channel(): String?
+}

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelMetadataEvent.kt

@@ -15,8 +15,9 @@ class ChannelMetadataEvent(
     tags: List<List<String>>,
     content: String,
     sig: HexKey
-) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
-    fun channel() = tags.firstOrNull { it.size > 1 && it[0] == "e" }?.get(1)
+) : Event(id, pubKey, createdAt, kind, tags, content, sig), IsInPublicChatChannel {
+
+    override fun channel() = tags.firstOrNull { it.size > 1 && it[0] == "e" }?.get(1)
     fun channelInfo() =
         try {
             MetadataEvent.gson.fromJson(content, ChannelCreateEvent.ChannelData::class.java)

app/src/main/java/com/vitorpamplona/amethyst/service/model/ChannelMuteUserEvent.kt

@@ -14,7 +14,12 @@ class ChannelMuteUserEvent(
     tags: List<List<String>>,
     content: String,
     sig: HexKey
-) : Event(id, pubKey, createdAt, kind, tags, content, sig) {
+) : Event(id, pubKey, createdAt, kind, tags, content, sig), IsInPublicChatChannel {
+    override fun channel() = tags.firstOrNull {
+        it.size > 3 && it[0] == "e" && it[3] == "root"
+    }?.get(1) ?: tags.firstOrNull {
+        it.size > 1 && it[0] == "e"
+    }?.get(1)
 
     fun usersToMute() = tags.filter { it.firstOrNull() == "p" }.mapNotNull { it.getOrNull(1) }
 

app/src/main/java/com/vitorpamplona/amethyst/service/model/CommunityPostApprovalEvent.kt

@@ -26,6 +26,22 @@ class CommunityPostApprovalEvent(
         null
     }
 
+    fun communities() = tags.filter { it.size > 1 && it[0] == "a" }.mapNotNull {
+        val aTag = ATag.parse(it[1], it.getOrNull(2))
+
+        if (aTag?.kind == CommunityDefinitionEvent.kind) {
+            aTag
+        } else {
+            null
+        }
+    }
+
+    fun approvedEvents() = tags.filter {
+        it.size > 1 && (it[0] == "e" || (it[0] == "a" && ATag.parse(it[1], null)?.kind != CommunityDefinitionEvent.kind))
+    }.map {
+        it[1]
+    }
+
     companion object {
         const val kind = 4550
 

app/src/main/java/com/vitorpamplona/amethyst/service/model/Event.kt

@@ -71,10 +71,29 @@ open class Event(
 
     override fun isTaggedUser(idHex: String) = tags.any { it.size > 1 && it[0] == "p" && it[1] == idHex }
 
+    override fun isTaggedAddressableNote(idHex: String) = tags.any { it.size > 1 && it[0] == "a" && it[1] == idHex }
+
     override fun isTaggedHash(hashtag: String) = tags.any { it.size > 1 && it[0] == "t" && it[1].equals(hashtag, true) }
     override fun isTaggedHashes(hashtags: Set<String>) = tags.any { it.size > 1 && it[0] == "t" && it[1].lowercase() in hashtags }
     override fun firstIsTaggedHashes(hashtags: Set<String>) = tags.firstOrNull { it.size > 1 && it[0] == "t" && it[1].lowercase() in hashtags }?.getOrNull(1)
 
+    override fun firstIsTaggedAddressableNote(addressableNotes: Set<String>) = tags.firstOrNull { it.size > 1 && it[0] == "a" && it[1] in addressableNotes }?.getOrNull(1)
+
+    override fun isTaggedAddressableKind(kind: Int): Boolean {
+        val kindStr = kind.toString()
+        return tags.any { it.size > 1 && it[0] == "a" && it[1].startsWith(kindStr) }
+    }
+
+    override fun getTagOfAddressableKind(kind: Int): ATag? {
+        val kindStr = kind.toString()
+        val aTag = tags
+            .firstOrNull { it.size > 1 && it[0] == "a" && it[1].startsWith(kindStr) }
+            ?.getOrNull(1)
+            ?: return null
+
+        return ATag.parse(aTag, null)
+    }
+
     override fun getPoWRank(): Int {
         var rank = 0
         for (i in 0..id.length) {

app/src/main/java/com/vitorpamplona/amethyst/service/model/EventInterface.kt

@@ -27,10 +27,16 @@ interface EventInterface {
     fun hasValidSignature(): Boolean
 
     fun isTaggedUser(idHex: String): Boolean
+    fun isTaggedAddressableNote(idHex: String): Boolean
 
     fun isTaggedHash(hashtag: String): Boolean
     fun isTaggedHashes(hashtags: Set<String>): Boolean
     fun firstIsTaggedHashes(hashtags: Set<String>): String?
+    fun firstIsTaggedAddressableNote(addressableNotes: Set<String>): String?
+
+    fun isTaggedAddressableKind(kind: Int): Boolean
+    fun getTagOfAddressableKind(kind: Int): ATag?
+
     fun hashtags(): List<String>
 
     fun getReward(): BigDecimal?

app/src/main/java/com/vitorpamplona/amethyst/service/model/LiveActivitiesEvent.kt

@@ -23,13 +23,13 @@ class LiveActivitiesEvent(
     fun summary() = tags.firstOrNull { it.size > 1 && it[0] == "summary" }?.get(1)
     fun image() = tags.firstOrNull { it.size > 1 && it[0] == "image" }?.get(1)
     fun streaming() = tags.firstOrNull { it.size > 1 && it[0] == "streaming" }?.get(1)
-    fun starts() = tags.firstOrNull { it.size > 1 && it[0] == "starts" }?.get(1)
+    fun starts() = tags.firstOrNull { it.size > 1 && it[0] == "starts" }?.get(1)?.toLongOrNull()
     fun ends() = tags.firstOrNull { it.size > 1 && it[0] == "ends" }?.get(1)
     fun status() = checkStatus(tags.firstOrNull { it.size > 1 && it[0] == "status" }?.get(1))
     fun currentParticipants() = tags.firstOrNull { it.size > 1 && it[0] == "current_participants" }?.get(1)
     fun totalParticipants() = tags.firstOrNull { it.size > 1 && it[0] == "total_participants" }?.get(1)
 
-    fun participants() = tags.filter { it.size > 1 && it[0] == "p" }.map { Participant(it[1], it.getOrNull(2)) }
+    fun participants() = tags.filter { it.size > 1 && it[0] == "p" }.map { Participant(it[1], it.getOrNull(3)) }
 
     fun checkStatus(eventStatus: String?): String? {
         return if (eventStatus == STATUS_LIVE && createdAt < Date().time / 1000 - (60 * 60 * 8)) { // 2 hours {

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/CommunityFeedFilter.kt

@@ -0,0 +1,35 @@
+package com.vitorpamplona.amethyst.ui.dal
+
+import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.model.AddressableNote
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.model.CommunityPostApprovalEvent
+
+class CommunityFeedFilter(val note: AddressableNote, val account: Account) : AdditiveFeedFilter<Note>() {
+    override fun feedKey(): String {
+        return account.userProfile().pubkeyHex + "-" + note.idHex
+    }
+
+    override fun feed(): List<Note> {
+        return sort(innerApplyFilter(LocalCache.notes.values))
+    }
+
+    override fun applyFilter(collection: Set<Note>): Set<Note> {
+        return innerApplyFilter(collection)
+    }
+
+    private fun innerApplyFilter(collection: Collection<Note>): Set<Note> {
+        return collection
+            .asSequence()
+            .filter { it.event is CommunityPostApprovalEvent } // Only Approvals
+            .filter { it.event?.isTaggedAddressableNote(note.idHex) == true } // Of the given community
+            .mapNotNull { it.replyTo }.flatten() // get approved posts
+            .filter { it.isNewThread() } // check if it is a new thread
+            .toSet()
+    }
+
+    override fun sort(collection: Set<Note>): List<Note> {
+        return collection.sortedWith(compareBy({ it.createdAt() }, { it.idHex })).reversed()
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/DiscoverChatFeedFilter.kt

@@ -0,0 +1,66 @@
+package com.vitorpamplona.amethyst.ui.dal
+
+import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.model.GLOBAL_FOLLOWS
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.model.ParticipantListBuilder
+import com.vitorpamplona.amethyst.service.model.*
+
+open class DiscoverChatFeedFilter(val account: Account) : AdditiveFeedFilter<Note>() {
+    override fun feedKey(): String {
+        return account.userProfile().pubkeyHex + "-" + account.defaultDiscoveryFollowList
+    }
+
+    override fun feed(): List<Note> {
+        val allChannelNotes = LocalCache.channels.values.mapNotNull { LocalCache.getNoteIfExists(it.idHex) }
+
+        val notes = innerApplyFilter(allChannelNotes)
+
+        return sort(notes)
+    }
+
+    override fun applyFilter(collection: Set<Note>): Set<Note> {
+        return innerApplyFilter(collection)
+    }
+
+    protected open fun innerApplyFilter(collection: Collection<Note>): Set<Note> {
+        val now = System.currentTimeMillis() / 1000
+        val isGlobal = account.defaultDiscoveryFollowList == GLOBAL_FOLLOWS
+
+        val followingKeySet = account.selectedUsersFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
+        val followingTagSet = account.selectedTagsFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
+
+        val createEvents = collection.filter { it.event is ChannelCreateEvent }
+        val anyOtherChannelEvent = collection
+            .asSequence()
+            .filter { it.event is IsInPublicChatChannel }
+            .mapNotNull { (it.event as? ChannelMessageEvent)?.channel() }
+            .mapNotNull { LocalCache.checkGetOrCreateNote(it) }
+            .toSet()
+
+        val activities = (createEvents + anyOtherChannelEvent)
+            .asSequence()
+            .filter { it.event is ChannelCreateEvent }
+            .filter { isGlobal || it.author?.pubkeyHex in followingKeySet || it.event?.isTaggedHashes(followingTagSet) == true }
+            .filter { it.author?.let { !account.isHidden(it.pubkeyHex) } ?: true }
+            .filter { (it.createdAt() ?: 0) <= now }
+            .toSet()
+
+        return activities
+    }
+
+    override fun sort(collection: Set<Note>): List<Note> {
+        val followingKeySet = account.selectedUsersFollowList(account.defaultDiscoveryFollowList)
+
+        val counter = ParticipantListBuilder()
+
+        return collection.sortedWith(
+            compareBy(
+                { counter.countFollowsThatParticipateOn(it, followingKeySet) },
+                { it.createdAt() },
+                { it.idHex }
+            )
+        ).reversed()
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/DiscoverCommunityFeedFilter.kt

@@ -0,0 +1,57 @@
+package com.vitorpamplona.amethyst.ui.dal
+
+import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.model.GLOBAL_FOLLOWS
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.model.ParticipantListBuilder
+import com.vitorpamplona.amethyst.service.model.*
+
+open class DiscoverCommunityFeedFilter(val account: Account) : AdditiveFeedFilter<Note>() {
+    override fun feedKey(): String {
+        return account.userProfile().pubkeyHex + "-" + account.defaultDiscoveryFollowList
+    }
+
+    override fun feed(): List<Note> {
+        val allNotes = LocalCache.addressables.values
+
+        val notes = innerApplyFilter(allNotes)
+
+        return sort(notes)
+    }
+
+    override fun applyFilter(collection: Set<Note>): Set<Note> {
+        return innerApplyFilter(collection)
+    }
+
+    protected open fun innerApplyFilter(collection: Collection<Note>): Set<Note> {
+        val now = System.currentTimeMillis() / 1000
+        val isGlobal = account.defaultDiscoveryFollowList == GLOBAL_FOLLOWS
+
+        val followingKeySet = account.selectedUsersFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
+        val followingTagSet = account.selectedTagsFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
+
+        val activities = collection
+            .asSequence()
+            .filter { it.event is CommunityDefinitionEvent }
+            .filter { isGlobal || it.author?.pubkeyHex in followingKeySet || it.event?.isTaggedHashes(followingTagSet) == true }
+            .filter { it.author?.let { !account.isHidden(it.pubkeyHex) } ?: true }
+            .filter { (it.createdAt() ?: 0) <= now }
+            .toSet()
+
+        return activities
+    }
+
+    override fun sort(collection: Set<Note>): List<Note> {
+        val followingKeySet = account.selectedUsersFollowList(account.defaultDiscoveryFollowList)
+        val counter = ParticipantListBuilder()
+
+        return collection.sortedWith(
+            compareBy(
+                { counter.countFollowsThatParticipateOn(it, followingKeySet) },
+                { it.createdAt() },
+                { it.idHex }
+            )
+        ).reversed()
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/DiscoverLiveFeedFilter.kt

@@ -4,18 +4,20 @@ import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.GLOBAL_FOLLOWS
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.model.ParticipantListBuilder
 import com.vitorpamplona.amethyst.service.model.*
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_ENDED
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_LIVE
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_PLANNED
 
-open class DiscoverFeedFilter(val account: Account) : AdditiveFeedFilter<Note>() {
+open class DiscoverLiveFeedFilter(val account: Account) : AdditiveFeedFilter<Note>() {
     override fun feedKey(): String {
         return account.userProfile().pubkeyHex + "-" + account.defaultDiscoveryFollowList
     }
 
     override fun feed(): List<Note> {
-        val allChannelNotes = LocalCache.channels.values.mapNotNull { LocalCache.getNoteIfExists(it.idHex) }
+        val allChannelNotes =
+            LocalCache.channels.values.mapNotNull { LocalCache.getNoteIfExists(it.idHex) }
         val allMessageNotes = LocalCache.channels.values.map { it.notes.values }.flatten()
 
         val notes = innerApplyFilter(allChannelNotes + allMessageNotes)
@@ -31,13 +33,19 @@ open class DiscoverFeedFilter(val account: Account) : AdditiveFeedFilter<Note>()
         val now = System.currentTimeMillis() / 1000
         val isGlobal = account.defaultDiscoveryFollowList == GLOBAL_FOLLOWS
 
-        val followingKeySet = account.selectedUsersFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
-        val followingTagSet = account.selectedTagsFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
+        val followingKeySet =
+            account.selectedUsersFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
+        val followingTagSet =
+            account.selectedTagsFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
 
         val activities = collection
             .asSequence()
             .filter { it.event is LiveActivitiesEvent }
-            .filter { isGlobal || it.author?.pubkeyHex in followingKeySet || it.event?.isTaggedHashes(followingTagSet) == true }
+            .filter {
+                isGlobal || it.author?.pubkeyHex in followingKeySet || it.event?.isTaggedHashes(
+                    followingTagSet
+                ) == true
+            }
             .filter { it.author?.let { !account.isHidden(it.pubkeyHex) } ?: true }
             .filter { (it.createdAt() ?: 0) <= now }
             .toSet()
@@ -46,9 +54,14 @@ open class DiscoverFeedFilter(val account: Account) : AdditiveFeedFilter<Note>()
     }
 
     override fun sort(collection: Set<Note>): List<Note> {
+        val followingKeySet = account.selectedUsersFollowList(account.defaultDiscoveryFollowList)
+
+        val counter = ParticipantListBuilder()
+
         return collection.sortedWith(
             compareBy(
                 { convertStatusToOrder((it.event as? LiveActivitiesEvent)?.status()) },
+                { counter.countFollowsThatParticipateOn(it, followingKeySet) },
                 { it.createdAt() },
                 { it.idHex }
             )

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/DiscoverLiveNowFeedFilter.kt

@@ -6,7 +6,7 @@ import com.vitorpamplona.amethyst.service.OnlineChecker
 import com.vitorpamplona.amethyst.service.model.*
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_LIVE
 
-class DiscoverLiveNowFeedFilter(account: Account) : DiscoverFeedFilter(account) {
+class DiscoverLiveNowFeedFilter(account: Account) : DiscoverLiveFeedFilter(account) {
     override fun innerApplyFilter(collection: Collection<Note>): Set<Note> {
         val allItems = super.innerApplyFilter(collection)
 

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/HashtagFeedFilter.kt

@@ -8,19 +8,12 @@ import com.vitorpamplona.amethyst.service.model.LongTextNoteEvent
 import com.vitorpamplona.amethyst.service.model.PrivateDmEvent
 import com.vitorpamplona.amethyst.service.model.TextNoteEvent
 
-object HashtagFeedFilter : AdditiveFeedFilter<Note>() {
-    lateinit var account: Account
-    var tag: String? = null
+class HashtagFeedFilter(val tag: String, val account: Account) : AdditiveFeedFilter<Note>() {
 
     override fun feedKey(): String {
         return account.userProfile().pubkeyHex + "-" + tag
     }
 
-    fun loadHashtag(account: Account, tag: String?) {
-        this.account = account
-        this.tag = tag
-    }
-
     override fun feed(): List<Note> {
         return sort(innerApplyFilter(LocalCache.notes.values))
     }

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/HiddenAccountsFeedFilter.kt

@@ -6,7 +6,7 @@ import com.vitorpamplona.amethyst.model.User
 
 class HiddenAccountsFeedFilter(val account: Account) : FeedFilter<User>() {
     override fun feedKey(): String {
-        return account.userProfile().pubkeyHex + "-" + HashtagFeedFilter.tag
+        return account.userProfile().pubkeyHex
     }
 
     override fun feed(): List<User> {

app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/AppNavigation.kt

@@ -12,7 +12,9 @@ import androidx.navigation.compose.composable
 import com.vitorpamplona.amethyst.ui.note.UserReactionsViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrChatroomListKnownFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrChatroomListNewFeedViewModel
-import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverChatFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverCommunityFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverLiveFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeRepliesFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrVideoFeedViewModel
@@ -22,6 +24,7 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.BookmarkListScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChannelScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChatroomListScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChatroomScreen
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.CommunityScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.DiscoverScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.HashtagScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.HiddenUsersScreen
@@ -42,7 +45,9 @@ fun AppNavigation(
     knownFeedViewModel: NostrChatroomListKnownFeedViewModel,
     newFeedViewModel: NostrChatroomListNewFeedViewModel,
     videoFeedViewModel: NostrVideoFeedViewModel,
-    discoveryFeedViewModel: NostrDiscoverFeedViewModel,
+    discoveryLiveFeedViewModel: NostrDiscoverLiveFeedViewModel,
+    discoveryCommunityFeedViewModel: NostrDiscoverCommunityFeedViewModel,
+    discoveryChatFeedViewModel: NostrDiscoverChatFeedViewModel,
     notifFeedViewModel: NotificationViewModel,
     userReactionsStatsModel: UserReactionsViewModel,
 
@@ -109,7 +114,9 @@ fun AppNavigation(
         Route.Discover.let { route ->
             composable(route.route, route.arguments, content = {
                 DiscoverScreen(
-                    discoveryFeedViewModel = discoveryFeedViewModel,
+                    discoveryLiveFeedViewModel = discoveryLiveFeedViewModel,
+                    discoveryCommunityFeedViewModel = discoveryCommunityFeedViewModel,
+                    discoveryChatFeedViewModel = discoveryChatFeedViewModel,
                     accountViewModel = accountViewModel,
                     nav = nav
                 )
@@ -169,6 +176,16 @@ fun AppNavigation(
             })
         }
 
+        Route.Community.let { route ->
+            composable(route.route, route.arguments, content = {
+                CommunityScreen(
+                    aTagHex = it.arguments?.getString("id"),
+                    accountViewModel = accountViewModel,
+                    nav = nav
+                )
+            })
+        }
+
         Route.Room.let { route ->
             composable(route.route, route.arguments, content = {
                 ChatroomScreen(

app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/DrawerContent.kt

@@ -582,7 +582,7 @@ fun IconRowRelays(relayViewModel: RelayPoolViewModel, onClick: () -> Unit) {
 
             Text(
                 modifier = Modifier.padding(start = 16.dp),
-                text = stringResource(id = R.string.relays),
+                text = stringResource(id = R.string.relay_setup),
                 fontSize = 18.sp
             )
 

app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/Routes.kt

@@ -104,6 +104,12 @@ sealed class Route(
         arguments = listOf(navArgument("id") { type = NavType.StringType }).toImmutableList()
     )
 
+    object Community : Route(
+        route = "Community/{id}",
+        icon = R.drawable.ic_moments,
+        arguments = listOf(navArgument("id") { type = NavType.StringType }).toImmutableList()
+    )
+
     object Room : Route(
         route = "Room/{id}",
         icon = R.drawable.ic_moments,
@@ -195,7 +201,7 @@ object DiscoverLatestItem : LatestItem() {
     ): Boolean {
         checkNotInMainThread()
 
-        val lastTime = account.loadLastRead(Route.Discover.base)
+        val lastTime = account.loadLastRead(Route.Discover.base + "Live")
 
         val newestItem = updateNewestItem(newNotes, account, DiscoverLiveNowFeedFilter(account))
 

app/src/main/java/com/vitorpamplona/amethyst/ui/note/ChannelCardCompose.kt

@@ -3,15 +3,20 @@ package com.vitorpamplona.amethyst.ui.note
 import androidx.compose.animation.Crossfade
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ExperimentalLayoutApi
 import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.MutableState
@@ -23,20 +28,29 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment.Companion.BottomStart
+import androidx.compose.ui.Alignment.Companion.CenterVertically
 import androidx.compose.ui.Alignment.Companion.TopEnd
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.compositeOver
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
 import androidx.lifecycle.distinctUntilChanged
 import androidx.lifecycle.map
 import coil.compose.AsyncImage
+import com.vitorpamplona.amethyst.model.Channel
+import com.vitorpamplona.amethyst.model.KIND3_FOLLOWS
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.model.ParticipantListBuilder
 import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.service.OnlineChecker
+import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
+import com.vitorpamplona.amethyst.service.model.CommunityDefinitionEvent
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_ENDED
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_LIVE
@@ -48,9 +62,13 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.EndedFlag
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.LiveFlag
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.OfflineFlag
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ScheduledFlag
+import com.vitorpamplona.amethyst.ui.theme.DoubleHorzSpacer
 import com.vitorpamplona.amethyst.ui.theme.QuoteBorder
 import com.vitorpamplona.amethyst.ui.theme.Size35dp
+import com.vitorpamplona.amethyst.ui.theme.StdPadding
+import com.vitorpamplona.amethyst.ui.theme.StdVertSpacer
 import com.vitorpamplona.amethyst.ui.theme.newItemBackgroundColor
+import com.vitorpamplona.amethyst.ui.theme.placeholderText
 import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.persistentListOf
 import kotlinx.collections.immutable.persistentSetOf
@@ -300,7 +318,7 @@ fun InnerChannelCardWithReactions(
     accountViewModel: AccountViewModel,
     nav: (String) -> Unit
 ) {
-    Column() {
+    Column(StdPadding) {
         RenderNoteRow(
             baseNote,
             accountViewModel,
@@ -319,6 +337,12 @@ private fun RenderNoteRow(
         is LiveActivitiesEvent -> {
             RenderLiveActivityThumb(baseNote, accountViewModel, nav)
         }
+        is CommunityDefinitionEvent -> {
+            RenderCommunitiesThumb(baseNote, accountViewModel, nav)
+        }
+        is ChannelCreateEvent -> {
+            RenderChannelThumb(baseNote, accountViewModel, nav)
+        }
     }
 }
 
@@ -339,6 +363,7 @@ fun RenderLiveActivityThumb(baseNote: Note, accountViewModel: AccountViewModel,
     val content = remember(eventUpdates) { noteEvent.summary() }
     val participants = remember(eventUpdates) { noteEvent.participants() }
     val status = remember(eventUpdates) { noteEvent.status() }
+    val starts = remember(eventUpdates) { noteEvent.starts() }
 
     var isOnline by remember { mutableStateOf(false) }
 
@@ -359,29 +384,31 @@ fun RenderLiveActivityThumb(baseNote: Note, accountViewModel: AccountViewModel,
 
     LaunchedEffect(key1 = eventUpdates) {
         launch(Dispatchers.IO) {
-            val channel = LocalCache.getChannelIfExists(baseNote.idHex)
-            val repliesByFollows = channel?.notes?.mapNotNull { it.value.author?.pubkeyHex }?.toSet() ?: emptySet()
-
-            val zappers = baseNote.publicZapAuthors()
-            val likeAuthors = baseNote.reactionAuthors()
-
-            val allParticipants = (repliesByFollows + zappers + likeAuthors).filter { accountViewModel.isFollowing(it) }
-
-            val newParticipantUsers = (
-                participants.mapNotNull { part ->
-                    if (part.key != baseNote.author?.pubkeyHex) {
-                        LocalCache.checkGetOrCreateUser(part.key)
-                    } else {
-                        null
-                    }
-                } + allParticipants.mapNotNull {
-                    if (it != baseNote.author?.pubkeyHex) {
-                        LocalCache.checkGetOrCreateUser(it)
-                    } else {
-                        null
-                    }
+            val hosts = participants.mapNotNull { part ->
+                if (part.key != baseNote.author?.pubkeyHex) {
+                    LocalCache.checkGetOrCreateUser(part.key)
+                } else {
+                    null
                 }
-                ).toImmutableList()
+            }
+
+            val hostsAuthor = hosts + (
+                baseNote.author?.let {
+                    listOf(it)
+                } ?: emptyList<User>()
+                )
+
+            val followingKeySet = accountViewModel.account.selectedUsersFollowList(accountViewModel.account.defaultDiscoveryFollowList)
+            val allParticipants = ParticipantListBuilder().followsThatParticipateOn(baseNote, followingKeySet).minus(hostsAuthor)
+
+            val newParticipantUsers = if (followingKeySet == null) {
+                val allFollows = accountViewModel.account.selectedUsersFollowList(KIND3_FOLLOWS)
+                val followingParticipants = ParticipantListBuilder().followsThatParticipateOn(baseNote, allFollows).minus(hostsAuthor)
+
+                (hosts + followingParticipants + (allParticipants - followingParticipants)).toImmutableList()
+            } else {
+                (hosts + allParticipants).toImmutableList()
+            }
 
             if (!equalImmutableLists(newParticipantUsers, participantUsers)) {
                 participantUsers = newParticipantUsers
@@ -429,7 +456,7 @@ fun RenderLiveActivityThumb(baseNote: Note, accountViewModel: AccountViewModel,
                             EndedFlag()
                         }
                         STATUS_PLANNED -> {
-                            ScheduledFlag()
+                            ScheduledFlag(starts)
                         }
                         else -> {
                             EndedFlag()
@@ -438,13 +465,13 @@ fun RenderLiveActivityThumb(baseNote: Note, accountViewModel: AccountViewModel,
                 }
             }
 
-            Box(Modifier.padding(10.dp).align(BottomStart)) {
+            Box(
+                Modifier
+                    .padding(10.dp)
+                    .align(BottomStart)
+            ) {
                 if (participantUsers.isNotEmpty()) {
-                    FlowRow() {
-                        participantUsers.forEach {
-                            ClickableUserPicture(it, Size35dp, accountViewModel)
-                        }
-                    }
+                    Gallery(participantUsers, accountViewModel)
                 }
             }
         }
@@ -463,6 +490,244 @@ fun RenderLiveActivityThumb(baseNote: Note, accountViewModel: AccountViewModel,
     }
 }
 
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun RenderCommunitiesThumb(baseNote: Note, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    val noteEvent = baseNote.event as? CommunityDefinitionEvent ?: return
+
+    val eventUpdates by baseNote.live().metadata.observeAsState()
+
+    val name = remember(eventUpdates) { noteEvent.dTag() }
+    val description = remember(eventUpdates) { noteEvent.description() }
+    val cover by remember(eventUpdates) {
+        derivedStateOf {
+            noteEvent.image()?.ifBlank { null }
+        }
+    }
+    val moderators = remember(eventUpdates) { noteEvent.moderators() }
+
+    var participantUsers by remember {
+        mutableStateOf<ImmutableList<User>>(
+            persistentListOf()
+        )
+    }
+
+    LaunchedEffect(key1 = eventUpdates) {
+        launch(Dispatchers.IO) {
+            val hosts = moderators.mapNotNull { part ->
+                if (part.key != baseNote.author?.pubkeyHex) {
+                    LocalCache.checkGetOrCreateUser(part.key)
+                } else {
+                    null
+                }
+            }
+
+            val followingKeySet = accountViewModel.account.selectedUsersFollowList(accountViewModel.account.defaultDiscoveryFollowList)
+            val allParticipants = ParticipantListBuilder().followsThatParticipateOn(baseNote, followingKeySet).minus(hosts)
+
+            val newParticipantUsers = if (followingKeySet == null) {
+                val allFollows = accountViewModel.account.selectedUsersFollowList(KIND3_FOLLOWS)
+                val followingParticipants = ParticipantListBuilder().followsThatParticipateOn(baseNote, allFollows).minus(hosts)
+
+                (hosts + followingParticipants + (allParticipants - followingParticipants)).toImmutableList()
+            } else {
+                (hosts + allParticipants).toImmutableList()
+            }
+
+            if (!equalImmutableLists(newParticipantUsers, participantUsers)) {
+                participantUsers = newParticipantUsers
+            }
+        }
+    }
+
+    Row(Modifier.fillMaxWidth()) {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth(0.3f)
+                .aspectRatio(ratio = 1f)
+        ) {
+            cover?.let {
+                Box(contentAlignment = BottomStart) {
+                    AsyncImage(
+                        model = it,
+                        contentDescription = null,
+                        contentScale = ContentScale.Crop,
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .clip(QuoteBorder)
+                    )
+                }
+            } ?: run {
+                baseNote.author?.let {
+                    DisplayAuthorBanner(it)
+                }
+            }
+        }
+
+        Spacer(modifier = DoubleHorzSpacer)
+
+        Column(
+            modifier = Modifier.fillMaxWidth(),
+            verticalArrangement = Arrangement.SpaceBetween
+        ) {
+            Row() {
+                Text(
+                    text = name,
+                    fontWeight = FontWeight.Bold,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis
+                )
+            }
+
+            description?.let {
+                Spacer(modifier = StdVertSpacer)
+                Row() {
+                    Text(
+                        text = it,
+                        color = MaterialTheme.colors.placeholderText,
+                        maxLines = 3,
+                        overflow = TextOverflow.Ellipsis,
+                        fontSize = 14.sp
+                    )
+                }
+            }
+
+            if (participantUsers.isNotEmpty()) {
+                Spacer(modifier = StdVertSpacer)
+                Row(modifier = Modifier.fillMaxWidth()) {
+                    Gallery(participantUsers, accountViewModel)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun RenderChannelThumb(baseNote: Note, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    val noteEvent = baseNote.event as? ChannelCreateEvent ?: return
+
+    LoadChannel(baseChannelHex = baseNote.idHex) {
+        RenderChannelThumb(baseNote = baseNote, channel = it, accountViewModel, nav)
+    }
+}
+
+@Composable
+fun RenderChannelThumb(baseNote: Note, channel: Channel, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    val channelUpdates by channel.live.observeAsState()
+
+    val name = remember(channelUpdates) { channel.toBestDisplayName() }
+    val description = remember(channelUpdates) { channel.summary() }
+    val cover by remember(channelUpdates) {
+        derivedStateOf {
+            channel.profilePicture()?.ifBlank { null }
+        }
+    }
+
+    var participantUsers by remember(baseNote) {
+        mutableStateOf<ImmutableList<User>>(
+            persistentListOf()
+        )
+    }
+
+    LaunchedEffect(key1 = channelUpdates) {
+        launch(Dispatchers.IO) {
+            val followingKeySet = accountViewModel.account.selectedUsersFollowList(accountViewModel.account.defaultDiscoveryFollowList)
+            val allParticipants = ParticipantListBuilder().followsThatParticipateOn(baseNote, followingKeySet).toImmutableList()
+
+            val newParticipantUsers = if (followingKeySet == null) {
+                val allFollows = accountViewModel.account.selectedUsersFollowList(KIND3_FOLLOWS)
+                val followingParticipants = ParticipantListBuilder().followsThatParticipateOn(baseNote, allFollows).toList()
+
+                (followingParticipants + (allParticipants - followingParticipants)).toImmutableList()
+            } else {
+                allParticipants.toImmutableList()
+            }
+
+            if (!equalImmutableLists(newParticipantUsers, participantUsers)) {
+                participantUsers = newParticipantUsers
+            }
+        }
+    }
+
+    Row(Modifier.fillMaxWidth()) {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth(0.3f)
+                .aspectRatio(ratio = 1f)
+        ) {
+            cover?.let {
+                Box(contentAlignment = BottomStart) {
+                    AsyncImage(
+                        model = it,
+                        contentDescription = null,
+                        contentScale = ContentScale.Crop,
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .clip(QuoteBorder)
+                    )
+                }
+            } ?: run {
+                baseNote.author?.let {
+                    DisplayAuthorBanner(it)
+                }
+            }
+        }
+
+        Spacer(modifier = DoubleHorzSpacer)
+
+        Column(
+            modifier = Modifier.fillMaxWidth().fillMaxHeight()
+        ) {
+            Row() {
+                Text(
+                    text = name,
+                    fontWeight = FontWeight.Bold,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis
+                )
+            }
+
+            description?.let {
+                Spacer(modifier = StdVertSpacer)
+                Row() {
+                    Text(
+                        text = it,
+                        color = MaterialTheme.colors.placeholderText,
+                        maxLines = 3,
+                        overflow = TextOverflow.Ellipsis,
+                        fontSize = 14.sp
+                    )
+                }
+            }
+
+            if (participantUsers.isNotEmpty()) {
+                Spacer(modifier = StdVertSpacer)
+                Row() {
+                    Gallery(participantUsers, accountViewModel)
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun Gallery(users: List<User>, accountViewModel: AccountViewModel) {
+    FlowRow(verticalAlignment = CenterVertically) {
+        users.take(6).forEach {
+            ClickableUserPicture(it, Size35dp, accountViewModel)
+        }
+
+        if (users.size > 6) {
+            Text(
+                text = remember(users) { " + " + (showCount(users.size - 6)).toString() },
+                fontSize = 13.sp,
+                color = MaterialTheme.colors.onSurface
+            )
+        }
+    }
+}
+
 @Composable
 fun DisplayAuthorBanner(author: User) {
     val picture by author.live().metadata.map {

app/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -94,6 +94,7 @@ import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.model.UserMetadata
 import com.vitorpamplona.amethyst.service.OnlineChecker
+import com.vitorpamplona.amethyst.service.model.ATag
 import com.vitorpamplona.amethyst.service.model.AppDefinitionEvent
 import com.vitorpamplona.amethyst.service.model.AudioTrackEvent
 import com.vitorpamplona.amethyst.service.model.BadgeAwardEvent
@@ -102,6 +103,7 @@ import com.vitorpamplona.amethyst.service.model.BaseTextNoteEvent
 import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
 import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
 import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
+import com.vitorpamplona.amethyst.service.model.CommunityDefinitionEvent
 import com.vitorpamplona.amethyst.service.model.FileHeaderEvent
 import com.vitorpamplona.amethyst.service.model.FileStorageHeaderEvent
 import com.vitorpamplona.amethyst.service.model.GenericRepostEvent
@@ -147,6 +149,8 @@ import com.vitorpamplona.amethyst.ui.components.imageExtensions
 import com.vitorpamplona.amethyst.ui.screen.equalImmutableLists
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChannelHeader
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.JoinCommunityButton
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.LeaveCommunityButton
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.LiveFlag
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ReportNoteDialog
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ScheduledFlag
@@ -156,6 +160,7 @@ import com.vitorpamplona.amethyst.ui.theme.DoubleHorzSpacer
 import com.vitorpamplona.amethyst.ui.theme.DoubleVertSpacer
 import com.vitorpamplona.amethyst.ui.theme.Font14SP
 import com.vitorpamplona.amethyst.ui.theme.HalfPadding
+import com.vitorpamplona.amethyst.ui.theme.HalfStartPadding
 import com.vitorpamplona.amethyst.ui.theme.HalfVertSpacer
 import com.vitorpamplona.amethyst.ui.theme.QuoteBorder
 import com.vitorpamplona.amethyst.ui.theme.ShowMoreRelaysButtonBoxModifer
@@ -170,6 +175,7 @@ import com.vitorpamplona.amethyst.ui.theme.Size35dp
 import com.vitorpamplona.amethyst.ui.theme.Size55Modifier
 import com.vitorpamplona.amethyst.ui.theme.Size55dp
 import com.vitorpamplona.amethyst.ui.theme.StdHorzSpacer
+import com.vitorpamplona.amethyst.ui.theme.StdPadding
 import com.vitorpamplona.amethyst.ui.theme.StdStartPadding
 import com.vitorpamplona.amethyst.ui.theme.StdVertSpacer
 import com.vitorpamplona.amethyst.ui.theme.UserNameMaxRowHeight
@@ -432,6 +438,12 @@ fun NormalNote(
             accountViewModel = accountViewModel,
             nav = nav
         )
+        is CommunityDefinitionEvent -> CommunityHeader(
+            baseNote = baseNote,
+            showBottomDiviser = true,
+            accountViewModel = accountViewModel,
+            nav = nav
+        )
         is BadgeDefinitionEvent -> BadgeDisplay(baseNote = baseNote)
         is FileHeaderEvent -> FileHeaderDisplay(baseNote)
         is FileStorageHeaderEvent -> FileStorageHeaderDisplay(baseNote)
@@ -456,6 +468,113 @@ fun NormalNote(
     }
 }
 
+@Composable
+fun CommunityHeader(
+    baseNote: Note,
+    showBottomDiviser: Boolean,
+    modifier: Modifier = StdPadding,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    val scope = rememberCoroutineScope()
+    Column(
+        Modifier
+            .fillMaxWidth()
+            .clickable {
+                scope.launch {
+                    nav("Community/${baseNote.idHex}")
+                }
+            }
+    ) {
+        val channelState by baseNote.live().metadata.observeAsState()
+        val noteEvent = remember(channelState) { channelState?.note?.event as? CommunityDefinitionEvent } ?: return
+
+        Column(modifier = modifier) {
+            Row(verticalAlignment = Alignment.CenterVertically) {
+                noteEvent.image()?.let {
+                    RobohashAsyncImageProxy(
+                        robot = baseNote.idHex,
+                        model = it,
+                        contentDescription = stringResource(R.string.profile_image),
+                        contentScale = ContentScale.Crop,
+                        modifier = Modifier.padding(start = 10.dp)
+                            .width(Size35dp)
+                            .height(Size35dp)
+                            .clip(shape = CircleShape)
+                    )
+                }
+
+                Column(
+                    modifier = Modifier
+                        .padding(start = 10.dp)
+                        .weight(1f),
+                    verticalArrangement = Arrangement.Center
+                ) {
+                    Row(verticalAlignment = Alignment.CenterVertically) {
+                        Text(
+                            text = remember(channelState) { noteEvent.dTag() },
+                            fontWeight = FontWeight.Bold,
+                            maxLines = 1,
+                            overflow = TextOverflow.Ellipsis
+                        )
+                    }
+
+                    val summary = remember(channelState) {
+                        noteEvent.description()?.ifBlank { null }
+                    }
+
+                    if (summary != null) {
+                        Row(verticalAlignment = Alignment.CenterVertically) {
+                            Text(
+                                text = summary,
+                                color = MaterialTheme.colors.placeholderText,
+                                maxLines = 1,
+                                overflow = TextOverflow.Ellipsis,
+                                fontSize = 12.sp
+                            )
+                        }
+                    }
+                }
+
+                Row(
+                    modifier = Modifier
+                        .height(Size35dp)
+                        .padding(start = 5.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    CommunityActionOptions(baseNote, accountViewModel, nav)
+                }
+            }
+        }
+
+        if (showBottomDiviser) {
+            Divider(
+                thickness = 0.25.dp
+            )
+        }
+    }
+}
+
+@Composable
+private fun CommunityActionOptions(
+    note: Note,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    val accountState by accountViewModel.accountLiveData.observeAsState()
+    val isFollowing by remember(accountState) {
+        derivedStateOf {
+            accountState?.account?.followingCommunities?.contains(note.idHex) ?: false
+        }
+    }
+
+    if (isFollowing) {
+        LeaveCommunityButton(accountViewModel, note, nav)
+    } else {
+        JoinCommunityButton(accountViewModel, note, nav)
+    }
+}
+
 @Composable
 private fun CheckNewAndRenderNote(
     baseNote: Note,
@@ -821,6 +940,8 @@ fun routeFor(note: Note, loggedIn: User): String? {
         }
     } else if (noteEvent is PrivateDmEvent) {
         return "Room/${noteEvent.talkingWith(loggedIn.pubkeyHex)}"
+    } else if (noteEvent is CommunityDefinitionEvent) {
+        return "Community/${note.idHex}"
     } else {
         return "Note/${note.idHex}"
     }
@@ -849,7 +970,7 @@ fun RenderTextEvent(
         val subject = (note.event as? TextNoteEvent)?.subject()?.ifEmpty { null }
         val body = accountViewModel.decrypt(note)
 
-        if (subject != null) {
+        if (!subject.isNullOrBlank() && body?.split("\n")?.get(0)?.contains(subject) == false) {
             "## $subject\n$body"
         } else {
             body
@@ -1716,7 +1837,7 @@ private fun ReplyRow(
     }
 
     if (showReply) {
-        val replyingDirectlyTo = remember { note.replyTo?.lastOrNull() }
+        val replyingDirectlyTo = remember { note.replyTo?.lastOrNull { it.event?.kind() != CommunityDefinitionEvent.kind } }
         if (replyingDirectlyTo != null && unPackReply) {
             ReplyNoteComposition(replyingDirectlyTo, backgroundColor, accountViewModel, nav)
             Spacer(modifier = StdVertSpacer)
@@ -1818,12 +1939,18 @@ fun FirstUserInfoRow(
     nav: (String) -> Unit
 ) {
     Row(verticalAlignment = CenterVertically, modifier = remember { UserNameRowHeight }) {
-        val isRepost by remember {
+        val isRepost by remember(baseNote) {
             derivedStateOf {
                 baseNote.event is RepostEvent || baseNote.event is GenericRepostEvent
             }
         }
 
+        val isCommunityPost by remember(baseNote) {
+            derivedStateOf {
+                baseNote.event?.isTaggedAddressableKind(CommunityDefinitionEvent.kind) == true
+            }
+        }
+
         if (showAuthorPicture) {
             NoteAuthorPicture(baseNote, nav, accountViewModel, Size25dp)
             Spacer(HalfPadding)
@@ -1834,6 +1961,8 @@ fun FirstUserInfoRow(
 
         if (isRepost) {
             BoostedMark()
+        } else if (isCommunityPost) {
+            DisplayFollowingCommunityInPost(baseNote, accountViewModel, nav)
         } else {
             DisplayFollowingHashtagsInPost(baseNote, accountViewModel, nav)
         }
@@ -2142,6 +2271,19 @@ private fun LoadAndDisplayUser(
     }
 }
 
+@Composable
+fun DisplayFollowingCommunityInPost(
+    baseNote: Note,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    Column(HalfStartPadding) {
+        Row(verticalAlignment = CenterVertically) {
+            DisplayCommunity(baseNote, nav)
+        }
+    }
+}
+
 @Composable
 fun DisplayFollowingHashtagsInPost(
     baseNote: Note,
@@ -2192,6 +2334,37 @@ private fun DisplayTagList(firstTag: String, nav: (String) -> Unit) {
     )
 }
 
+@Composable
+private fun DisplayCommunity(note: Note, nav: (String) -> Unit) {
+    val communityTag = remember(note) {
+        note.event?.getTagOfAddressableKind(CommunityDefinitionEvent.kind)
+    } ?: return
+
+    val displayTag = remember(note) { AnnotatedString(getCommunityShortName(communityTag)) }
+    val route = remember(note) { "Community/${communityTag.toTag()}" }
+
+    ClickableText(
+        text = displayTag,
+        onClick = { nav(route) },
+        style = LocalTextStyle.current.copy(
+            color = MaterialTheme.colors.primary.copy(
+                alpha = 0.52f
+            )
+        ),
+        maxLines = 1
+    )
+}
+
+private fun getCommunityShortName(communityTag: ATag): String {
+    val name = if (communityTag.dTag.length > 10) {
+        communityTag.dTag.take(10) + "..."
+    } else {
+        communityTag.dTag.take(10)
+    }
+
+    return "/c/$name"
+}
+
 @OptIn(ExperimentalLayoutApi::class)
 @Composable
 fun DisplayUncitedHashtags(
@@ -2663,6 +2836,7 @@ fun RenderLiveActivityEventInner(baseNote: Note, accountViewModel: AccountViewMo
     val content = remember(eventUpdates) { noteEvent.summary() }
     val participants = remember(eventUpdates) { noteEvent.participants() }
     val status = remember(eventUpdates) { noteEvent.status() }
+    val starts = remember(eventUpdates) { noteEvent.starts() }
 
     var isOnline by remember { mutableStateOf(false) }
 
@@ -2698,7 +2872,7 @@ fun RenderLiveActivityEventInner(baseNote: Note, accountViewModel: AccountViewMo
                     }
                 }
                 STATUS_PLANNED -> {
-                    ScheduledFlag()
+                    ScheduledFlag(starts)
                 }
             }
         }

app/src/main/java/com/vitorpamplona/amethyst/ui/note/TimeAgoFormatter.kt

@@ -22,6 +22,7 @@ fun timeAgo(mills: Long?, context: Context): String {
         .replace(" hr. ago", context.getString(R.string.h))
         .replace(" min. ago", context.getString(R.string.m))
         .replace(" days ago", context.getString(R.string.d))
+        .replace("Yesterday", "1" + context.getString(R.string.d))
 }
 
 fun timeAgoShort(mills: Long?, context: Context): String {

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/FeedViewModel.kt

@@ -7,6 +7,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
 import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.model.AddressableNote
 import com.vitorpamplona.amethyst.model.Channel
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
@@ -21,7 +22,10 @@ import com.vitorpamplona.amethyst.ui.dal.ChannelFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.ChatroomFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.ChatroomListKnownFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.ChatroomListNewFeedFilter
-import com.vitorpamplona.amethyst.ui.dal.DiscoverFeedFilter
+import com.vitorpamplona.amethyst.ui.dal.CommunityFeedFilter
+import com.vitorpamplona.amethyst.ui.dal.DiscoverChatFeedFilter
+import com.vitorpamplona.amethyst.ui.dal.DiscoverCommunityFeedFilter
+import com.vitorpamplona.amethyst.ui.dal.DiscoverLiveFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.FeedFilter
 import com.vitorpamplona.amethyst.ui.dal.HashtagFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.HomeConversationsFeedFilter
@@ -66,10 +70,26 @@ class NostrVideoFeedViewModel(val account: Account) : FeedViewModel(VideoFeedFil
     }
 }
 
-class NostrDiscoverFeedViewModel(val account: Account) : FeedViewModel(DiscoverFeedFilter(account)) {
+class NostrDiscoverLiveFeedViewModel(val account: Account) : FeedViewModel(DiscoverLiveFeedFilter(account)) {
     class Factory(val account: Account) : ViewModelProvider.Factory {
-        override fun <NostrDiscoverFeedViewModel : ViewModel> create(modelClass: Class<NostrDiscoverFeedViewModel>): NostrDiscoverFeedViewModel {
-            return NostrDiscoverFeedViewModel(account) as NostrDiscoverFeedViewModel
+        override fun <NostrDiscoverLiveFeedViewModel : ViewModel> create(modelClass: Class<NostrDiscoverLiveFeedViewModel>): NostrDiscoverLiveFeedViewModel {
+            return NostrDiscoverLiveFeedViewModel(account) as NostrDiscoverLiveFeedViewModel
+        }
+    }
+}
+
+class NostrDiscoverCommunityFeedViewModel(val account: Account) : FeedViewModel(DiscoverCommunityFeedFilter(account)) {
+    class Factory(val account: Account) : ViewModelProvider.Factory {
+        override fun <NostrDiscoverCommunityFeedViewModel : ViewModel> create(modelClass: Class<NostrDiscoverCommunityFeedViewModel>): NostrDiscoverCommunityFeedViewModel {
+            return NostrDiscoverCommunityFeedViewModel(account) as NostrDiscoverCommunityFeedViewModel
+        }
+    }
+}
+
+class NostrDiscoverChatFeedViewModel(val account: Account) : FeedViewModel(DiscoverChatFeedFilter(account)) {
+    class Factory(val account: Account) : ViewModelProvider.Factory {
+        override fun <NostrDiscoverChatFeedViewModel : ViewModel> create(modelClass: Class<NostrDiscoverChatFeedViewModel>): NostrDiscoverChatFeedViewModel {
+            return NostrDiscoverChatFeedViewModel(account) as NostrDiscoverChatFeedViewModel
         }
     }
 }
@@ -97,7 +117,21 @@ class NostrUserProfileConversationsFeedViewModel(val user: User, val account: Ac
     }
 }
 
-class NostrHashtagFeedViewModel : FeedViewModel(HashtagFeedFilter)
+class NostrHashtagFeedViewModel(val hashtag: String, val account: Account) : FeedViewModel(HashtagFeedFilter(hashtag, account)) {
+    class Factory(val hashtag: String, val account: Account) : ViewModelProvider.Factory {
+        override fun <NostrHashtagFeedViewModel : ViewModel> create(modelClass: Class<NostrHashtagFeedViewModel>): NostrHashtagFeedViewModel {
+            return NostrHashtagFeedViewModel(hashtag, account) as NostrHashtagFeedViewModel
+        }
+    }
+}
+
+class NostrCommunityFeedViewModel(val note: AddressableNote, val account: Account) : FeedViewModel(CommunityFeedFilter(note, account)) {
+    class Factory(val note: AddressableNote, val account: Account) : ViewModelProvider.Factory {
+        override fun <NostrCommunityFeedViewModel : ViewModel> create(modelClass: Class<NostrCommunityFeedViewModel>): NostrCommunityFeedViewModel {
+            return NostrCommunityFeedViewModel(note, account) as NostrCommunityFeedViewModel
+        }
+    }
+}
 
 class NostrUserProfileReportFeedViewModel(val user: User) : FeedViewModel(UserProfileReportsFeedFilter(user)) {
     class Factory(val user: User) : ViewModelProvider.Factory {

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/RememberForeverStates.kt

@@ -20,10 +20,15 @@ object ScrollStateKeys {
     const val DISCOVER_SCREEN = "Discover"
     val HOME_FOLLOWS = Route.Home.base + "Follows"
     val HOME_REPLIES = Route.Home.base + "FollowsReplies"
+
+    val DISCOVER_LIVE = Route.Home.base + "Live"
+    val DISCOVER_COMMUNITY = Route.Home.base + "Communities"
+    val DISCOVER_CHATS = Route.Home.base + "Chats"
 }
 
 object PagerStateKeys {
-    const val HOME_SCREEN = "Home"
+    const val HOME_SCREEN = "PagerHome"
+    const val DISCOVER_SCREEN = "PagerDiscover"
 }
 
 @Composable

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/ThreadFeedView.kt

@@ -33,6 +33,7 @@ import androidx.compose.material.pullrefresh.rememberPullRefreshState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.runtime.mutableStateOf
@@ -59,6 +60,7 @@ import com.vitorpamplona.amethyst.service.model.AudioTrackEvent
 import com.vitorpamplona.amethyst.service.model.BadgeDefinitionEvent
 import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
 import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
+import com.vitorpamplona.amethyst.service.model.CommunityDefinitionEvent
 import com.vitorpamplona.amethyst.service.model.FileHeaderEvent
 import com.vitorpamplona.amethyst.service.model.FileStorageHeaderEvent
 import com.vitorpamplona.amethyst.service.model.GenericRepostEvent
@@ -295,7 +297,17 @@ fun NoteMaster(
                     Row(verticalAlignment = Alignment.CenterVertically) {
                         NoteUsernameDisplay(baseNote, Modifier.weight(1f))
 
-                        DisplayFollowingHashtagsInPost(baseNote, accountViewModel, nav)
+                        val isCommunityPost by remember(baseNote) {
+                            derivedStateOf {
+                                baseNote.event?.isTaggedAddressableKind(CommunityDefinitionEvent.kind) == true
+                            }
+                        }
+
+                        if (isCommunityPost) {
+                            DisplayFollowingCommunityInPost(baseNote, accountViewModel, nav)
+                        } else {
+                            DisplayFollowingHashtagsInPost(baseNote, accountViewModel, nav)
+                        }
 
                         Text(
                             timeAgo(note.createdAt(), context = context),

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/ChannelScreen.kt

@@ -98,6 +98,7 @@ import com.vitorpamplona.amethyst.ui.note.ChatroomMessageCompose
 import com.vitorpamplona.amethyst.ui.note.LikeReaction
 import com.vitorpamplona.amethyst.ui.note.UserPicture
 import com.vitorpamplona.amethyst.ui.note.ZapReaction
+import com.vitorpamplona.amethyst.ui.note.timeAgo
 import com.vitorpamplona.amethyst.ui.screen.NostrChannelFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.RefreshingChatroomFeedView
 import com.vitorpamplona.amethyst.ui.theme.ButtonBorder
@@ -703,9 +704,9 @@ private fun ChannelActionOptions(
     }
 
     if (isFollowing) {
-        LeaveButton(accountViewModel, channel, nav)
+        LeaveChatButton(accountViewModel, channel, nav)
     } else {
-        JoinButton(accountViewModel, channel, nav)
+        JoinChatButton(accountViewModel, channel, nav)
     }
 }
 
@@ -784,9 +785,12 @@ fun OfflineFlag() {
 }
 
 @Composable
-fun ScheduledFlag() {
+fun ScheduledFlag(starts: Long?) {
+    val context = LocalContext.current
+    val startsIn = starts?.let { timeAgo(it, context) }
+
     Text(
-        text = stringResource(id = R.string.live_stream_planned_tag),
+        text = startsIn ?: stringResource(id = R.string.live_stream_planned_tag),
         color = Color.White,
         fontWeight = FontWeight.Bold,
         modifier = remember {
@@ -864,7 +868,7 @@ private fun EditButton(accountViewModel: AccountViewModel, channel: PublicChatCh
 }
 
 @Composable
-private fun JoinButton(accountViewModel: AccountViewModel, channel: Channel, nav: (String) -> Unit) {
+fun JoinChatButton(accountViewModel: AccountViewModel, channel: Channel, nav: (String) -> Unit) {
     Button(
         modifier = Modifier.padding(horizontal = 3.dp),
         onClick = {
@@ -882,7 +886,7 @@ private fun JoinButton(accountViewModel: AccountViewModel, channel: Channel, nav
 }
 
 @Composable
-private fun LeaveButton(accountViewModel: AccountViewModel, channel: Channel, nav: (String) -> Unit) {
+fun LeaveChatButton(accountViewModel: AccountViewModel, channel: Channel, nav: (String) -> Unit) {
     Button(
         modifier = Modifier.padding(horizontal = 3.dp),
         onClick = {
@@ -899,3 +903,39 @@ private fun LeaveButton(accountViewModel: AccountViewModel, channel: Channel, na
         Text(text = stringResource(R.string.leave), color = Color.White)
     }
 }
+
+@Composable
+fun JoinCommunityButton(accountViewModel: AccountViewModel, note: Note, nav: (String) -> Unit) {
+    Button(
+        modifier = Modifier.padding(horizontal = 3.dp),
+        onClick = {
+            accountViewModel.account.joinCommunity(note.idHex)
+        },
+        shape = ButtonBorder,
+        colors = ButtonDefaults
+            .buttonColors(
+                backgroundColor = MaterialTheme.colors.primary
+            ),
+        contentPadding = PaddingValues(vertical = 6.dp, horizontal = 16.dp)
+    ) {
+        Text(text = stringResource(R.string.join), color = Color.White)
+    }
+}
+
+@Composable
+fun LeaveCommunityButton(accountViewModel: AccountViewModel, note: Note, nav: (String) -> Unit) {
+    Button(
+        modifier = Modifier.padding(horizontal = 3.dp),
+        onClick = {
+            accountViewModel.account.leaveCommunity((note.idHex))
+        },
+        shape = ButtonBorder,
+        colors = ButtonDefaults
+            .buttonColors(
+                backgroundColor = MaterialTheme.colors.primary
+            ),
+        contentPadding = PaddingValues(vertical = 6.dp, horizontal = 16.dp)
+    ) {
+        Text(text = stringResource(R.string.leave), color = Color.White)
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/CommunityScreen.kt

@@ -0,0 +1,105 @@
+package com.vitorpamplona.amethyst.ui.screen.loggedIn
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.vitorpamplona.amethyst.model.AddressableNote
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.service.NostrCommunityDataSource
+import com.vitorpamplona.amethyst.ui.note.CommunityHeader
+import com.vitorpamplona.amethyst.ui.screen.NostrCommunityFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.RefresheableFeedView
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+
+@Composable
+fun CommunityScreen(aTagHex: String?, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    if (aTagHex == null) return
+
+    var noteDefBase by remember { mutableStateOf<AddressableNote?>(LocalCache.getAddressableNoteIfExists(aTagHex)) }
+
+    if (noteDefBase == null) {
+        LaunchedEffect(aTagHex) {
+            // waits to resolve.
+            launch(Dispatchers.IO) {
+                val newNote = LocalCache.checkGetOrCreateAddressableNote(aTagHex)
+                if (newNote != noteDefBase) {
+                    noteDefBase = newNote
+                }
+            }
+        }
+    }
+
+    noteDefBase?.let {
+        PrepareViewModelsCommunityScreen(
+            note = it,
+            accountViewModel = accountViewModel,
+            nav = nav
+        )
+    }
+}
+
+@Composable
+fun PrepareViewModelsCommunityScreen(note: AddressableNote, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    val followsFeedViewModel: NostrCommunityFeedViewModel = viewModel(
+        key = note.idHex + "CommunityFeedViewModel",
+        factory = NostrCommunityFeedViewModel.Factory(
+            note,
+            accountViewModel.account
+        )
+    )
+
+    CommunityScreen(note, followsFeedViewModel, accountViewModel, nav)
+}
+
+@Composable
+fun CommunityScreen(note: AddressableNote, feedViewModel: NostrCommunityFeedViewModel, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    val lifeCycleOwner = LocalLifecycleOwner.current
+
+    NostrCommunityDataSource.loadCommunity(note)
+
+    LaunchedEffect(note) {
+        feedViewModel.invalidateData()
+    }
+
+    DisposableEffect(accountViewModel) {
+        val observer = LifecycleEventObserver { _, event ->
+            if (event == Lifecycle.Event.ON_RESUME) {
+                println("Community Start")
+                NostrCommunityDataSource.start()
+                feedViewModel.invalidateData()
+            }
+            if (event == Lifecycle.Event.ON_PAUSE) {
+                println("Community Stop")
+                NostrCommunityDataSource.loadCommunity(null)
+                NostrCommunityDataSource.stop()
+            }
+        }
+
+        lifeCycleOwner.lifecycle.addObserver(observer)
+        onDispose {
+            lifeCycleOwner.lifecycle.removeObserver(observer)
+        }
+    }
+
+    Column(Modifier.fillMaxHeight()) {
+        CommunityHeader(baseNote = note, showBottomDiviser = true, accountViewModel = accountViewModel, nav = nav)
+        RefresheableFeedView(
+            feedViewModel,
+            null,
+            accountViewModel = accountViewModel,
+            nav = nav
+        )
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/DiscoverScreen.kt

@@ -5,25 +5,36 @@ import androidx.compose.animation.core.tween
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.pager.HorizontalPager
+import androidx.compose.foundation.pager.PagerState
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Tab
+import androidx.compose.material.TabRow
+import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
-import androidx.lifecycle.viewmodel.compose.viewModel
+import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.service.NostrDiscoveryDataSource
 import com.vitorpamplona.amethyst.ui.navigation.Route
 import com.vitorpamplona.amethyst.ui.note.ChannelCardCompose
@@ -32,20 +43,37 @@ import com.vitorpamplona.amethyst.ui.screen.FeedError
 import com.vitorpamplona.amethyst.ui.screen.FeedState
 import com.vitorpamplona.amethyst.ui.screen.FeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.LoadingFeed
-import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverChatFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverCommunityFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverLiveFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.PagerStateKeys
 import com.vitorpamplona.amethyst.ui.screen.RefresheableView
 import com.vitorpamplona.amethyst.ui.screen.SaveableFeedState
 import com.vitorpamplona.amethyst.ui.screen.ScrollStateKeys
+import com.vitorpamplona.amethyst.ui.screen.rememberForeverPagerState
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.toImmutableList
+import kotlinx.coroutines.launch
 
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
 fun DiscoverScreen(
-    discoveryFeedViewModel: NostrDiscoverFeedViewModel,
+    discoveryLiveFeedViewModel: NostrDiscoverLiveFeedViewModel,
+    discoveryCommunityFeedViewModel: NostrDiscoverCommunityFeedViewModel,
+    discoveryChatFeedViewModel: NostrDiscoverChatFeedViewModel,
     accountViewModel: AccountViewModel,
     nav: (String) -> Unit
 ) {
     val lifeCycleOwner = LocalLifecycleOwner.current
 
-    WatchAccountForDiscoveryScreen(discoveryViewModel = discoveryFeedViewModel, accountViewModel = accountViewModel)
+    val pagerState = rememberForeverPagerState(key = PagerStateKeys.DISCOVER_SCREEN)
+
+    WatchAccountForDiscoveryScreen(
+        discoveryLiveFeedViewModel = discoveryLiveFeedViewModel,
+        discoveryCommunityFeedViewModel = discoveryCommunityFeedViewModel,
+        discoveryChatFeedViewModel = discoveryChatFeedViewModel,
+        accountViewModel = accountViewModel
+    )
 
     DisposableEffect(accountViewModel) {
         val observer = LifecycleEventObserver { _, event ->
@@ -53,10 +81,6 @@ fun DiscoverScreen(
                 println("Discovery Start")
                 NostrDiscoveryDataSource.start()
             }
-            if (event == Lifecycle.Event.ON_PAUSE) {
-                println("Discovery Stop")
-                NostrDiscoveryDataSource.stop()
-            }
         }
 
         lifeCycleOwner.lifecycle.addObserver(observer)
@@ -65,14 +89,56 @@ fun DiscoverScreen(
         }
     }
 
+    val tabs by remember(discoveryLiveFeedViewModel, discoveryCommunityFeedViewModel, discoveryChatFeedViewModel) {
+        mutableStateOf(
+            listOf(
+                TabItem(R.string.discover_live, discoveryLiveFeedViewModel, Route.Discover.base + "Live", ScrollStateKeys.DISCOVER_LIVE),
+                TabItem(R.string.discover_community, discoveryCommunityFeedViewModel, Route.Discover.base + "Community", ScrollStateKeys.DISCOVER_COMMUNITY),
+                TabItem(R.string.discover_chat, discoveryChatFeedViewModel, Route.Discover.base + "Chats", ScrollStateKeys.DISCOVER_CHATS)
+            ).toImmutableList()
+        )
+    }
+
     Column(Modifier.fillMaxHeight()) {
         Column(
             modifier = Modifier.padding(vertical = 0.dp)
         ) {
-            RefresheableView(discoveryFeedViewModel, true) {
-                SaveableFeedState(discoveryFeedViewModel, scrollStateKey = ScrollStateKeys.DISCOVER_SCREEN) { listState ->
-                    RenderDiscoverFeed(discoveryFeedViewModel, Route.Discover.base, accountViewModel, listState, nav)
+            DiscoverPages(pagerState, tabs, accountViewModel, nav)
+        }
+    }
+}
+
+@Composable
+@OptIn(ExperimentalFoundationApi::class)
+private fun DiscoverPages(
+    pagerState: PagerState,
+    tabs: ImmutableList<TabItem>,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    TabRow(
+        backgroundColor = MaterialTheme.colors.background,
+        selectedTabIndex = pagerState.currentPage
+    ) {
+        val coroutineScope = rememberCoroutineScope()
+
+        tabs.forEachIndexed { index, tab ->
+            Tab(
+                selected = pagerState.currentPage == index,
+                text = {
+                    Text(text = stringResource(tab.resource))
+                },
+                onClick = {
+                    coroutineScope.launch { pagerState.animateScrollToPage(index) }
                 }
+            )
+        }
+    }
+
+    HorizontalPager(pageCount = 3, state = pagerState) { page ->
+        RefresheableView(tabs[page].viewModel, true) {
+            SaveableFeedState(tabs[page].viewModel, scrollStateKey = tabs[page].scrollStateKey) { listState ->
+                RenderDiscoverFeed(tabs[page].viewModel, tabs[page].routeForLastRead, accountViewModel, listState, nav)
             }
         }
     }
@@ -123,12 +189,19 @@ private fun RenderDiscoverFeed(
 }
 
 @Composable
-fun WatchAccountForDiscoveryScreen(discoveryViewModel: NostrDiscoverFeedViewModel, accountViewModel: AccountViewModel) {
+fun WatchAccountForDiscoveryScreen(
+    discoveryLiveFeedViewModel: NostrDiscoverLiveFeedViewModel,
+    discoveryCommunityFeedViewModel: NostrDiscoverCommunityFeedViewModel,
+    discoveryChatFeedViewModel: NostrDiscoverChatFeedViewModel,
+    accountViewModel: AccountViewModel
+) {
     val accountState by accountViewModel.accountLiveData.observeAsState()
 
     LaunchedEffect(accountViewModel, accountState?.account?.defaultDiscoveryFollowList) {
         NostrDiscoveryDataSource.resetFilters()
-        discoveryViewModel.checkKeysInvalidateDataAndSendToTop()
+        discoveryLiveFeedViewModel.checkKeysInvalidateDataAndSendToTop()
+        discoveryCommunityFeedViewModel.checkKeysInvalidateDataAndSendToTop()
+        discoveryChatFeedViewModel.checkKeysInvalidateDataAndSendToTop()
     }
 }
 
@@ -150,16 +223,18 @@ private fun DiscoverFeedLoaded(
     ) {
         itemsIndexed(state.feed.value, key = { _, item -> item.idHex }) { _, item ->
             val defaultModifier = remember {
-                Modifier.padding(10.dp).animateItemPlacement()
+                Modifier.fillMaxWidth().animateItemPlacement()
             }
 
-            ChannelCardCompose(
-                baseNote = item,
-                routeForLastRead = routeForLastRead,
-                modifier = defaultModifier,
-                accountViewModel = accountViewModel,
-                nav = nav
-            )
+            Row(defaultModifier) {
+                ChannelCardCompose(
+                    baseNote = item,
+                    routeForLastRead = routeForLastRead,
+                    modifier = Modifier,
+                    accountViewModel = accountViewModel,
+                    nav = nav
+                )
+            }
         }
     }
 }

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/HashtagScreen.kt

@@ -18,6 +18,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -29,61 +30,77 @@ import androidx.lifecycle.LifecycleEventObserver
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.service.NostrHashtagDataSource
-import com.vitorpamplona.amethyst.ui.dal.HashtagFeedFilter
 import com.vitorpamplona.amethyst.ui.screen.NostrHashtagFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.RefresheableFeedView
+import com.vitorpamplona.amethyst.ui.theme.HalfPadding
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 
 @Composable
 fun HashtagScreen(tag: String?, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    if (tag == null) return
+
+    PrepareViewModelsHashtagScreen(tag, accountViewModel, nav)
+}
+
+@Composable
+fun PrepareViewModelsHashtagScreen(tag: String, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    val followsFeedViewModel: NostrHashtagFeedViewModel = viewModel(
+        key = tag + "HashtagFeedViewModel",
+        factory = NostrHashtagFeedViewModel.Factory(
+            tag,
+            accountViewModel.account
+        )
+    )
+
+    HashtagScreen(tag, followsFeedViewModel, accountViewModel, nav)
+}
+
+@Composable
+fun HashtagScreen(tag: String, feedViewModel: NostrHashtagFeedViewModel, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
     val lifeCycleOwner = LocalLifecycleOwner.current
 
-    if (tag != null) {
-        HashtagFeedFilter.loadHashtag(accountViewModel.account, tag)
-        val feedViewModel: NostrHashtagFeedViewModel = viewModel()
+    NostrHashtagDataSource.loadHashtag(tag)
 
-        LaunchedEffect(tag) {
-            HashtagFeedFilter.loadHashtag(accountViewModel.account, tag)
-            NostrHashtagDataSource.loadHashtag(tag)
-            feedViewModel.invalidateData()
-        }
+    LaunchedEffect(tag) {
+        NostrHashtagDataSource.start()
+        feedViewModel.invalidateData()
+    }
 
-        DisposableEffect(accountViewModel) {
-            val observer = LifecycleEventObserver { _, event ->
-                if (event == Lifecycle.Event.ON_RESUME) {
-                    println("Hashtag Start")
-                    HashtagFeedFilter.loadHashtag(accountViewModel.account, tag)
-                    NostrHashtagDataSource.loadHashtag(tag)
-                    NostrHashtagDataSource.start()
-                    feedViewModel.invalidateData()
-                }
-                if (event == Lifecycle.Event.ON_PAUSE) {
-                    println("Hashtag Stop")
-                    HashtagFeedFilter.loadHashtag(accountViewModel.account, null)
-                    NostrHashtagDataSource.loadHashtag(null)
-                    NostrHashtagDataSource.stop()
-                }
+    DisposableEffect(accountViewModel) {
+        val observer = LifecycleEventObserver { _, event ->
+            if (event == Lifecycle.Event.ON_RESUME) {
+                println("Hashtag Start")
+                NostrHashtagDataSource.loadHashtag(tag)
+                NostrHashtagDataSource.start()
+                feedViewModel.invalidateData()
             }
-
-            lifeCycleOwner.lifecycle.addObserver(observer)
-            onDispose {
-                lifeCycleOwner.lifecycle.removeObserver(observer)
+            if (event == Lifecycle.Event.ON_PAUSE) {
+                println("Hashtag Stop")
+                NostrHashtagDataSource.loadHashtag(null)
+                NostrHashtagDataSource.stop()
             }
         }
 
-        Column(Modifier.fillMaxHeight()) {
-            Column(
-                modifier = Modifier.padding(vertical = 0.dp)
-            ) {
-                HashtagHeader(tag, accountViewModel)
-                RefresheableFeedView(
-                    feedViewModel,
-                    null,
-                    accountViewModel = accountViewModel,
-                    nav = nav
-                )
-            }
+        lifeCycleOwner.lifecycle.addObserver(observer)
+        onDispose {
+            lifeCycleOwner.lifecycle.removeObserver(observer)
+            NostrHashtagDataSource.loadHashtag(null)
+            NostrHashtagDataSource.stop()
+        }
+    }
+
+    Column(Modifier.fillMaxHeight()) {
+        Column(
+            modifier = Modifier.padding(vertical = 0.dp)
+        ) {
+            HashtagHeader(tag, accountViewModel)
+            RefresheableFeedView(
+                feedViewModel,
+                null,
+                accountViewModel = accountViewModel,
+                nav = nav
+            )
         }
     }
 }
@@ -93,7 +110,7 @@ fun HashtagHeader(tag: String, account: AccountViewModel, onClick: () -> Unit =
     Column(
         Modifier.clickable { onClick() }
     ) {
-        Column(modifier = Modifier.padding(12.dp)) {
+        Column(modifier = HalfPadding) {
             Row(verticalAlignment = Alignment.CenterVertically) {
                 Column(
                     modifier = Modifier

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/MainScreen.kt

@@ -43,7 +43,9 @@ import com.vitorpamplona.amethyst.ui.screen.AccountState
 import com.vitorpamplona.amethyst.ui.screen.AccountStateViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrChatroomListKnownFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrChatroomListNewFeedViewModel
-import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverChatFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverCommunityFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverLiveFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeRepliesFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrVideoFeedViewModel
@@ -93,9 +95,19 @@ fun MainScreen(accountViewModel: AccountViewModel, accountStateViewModel: Accoun
         factory = NostrVideoFeedViewModel.Factory(accountViewModel.account)
     )
 
-    val discoveryFeedViewModel: NostrDiscoverFeedViewModel = viewModel(
-        key = accountViewModel.userProfile().pubkeyHex + "NostrDiscoveryFeedViewModel",
-        factory = NostrDiscoverFeedViewModel.Factory(accountViewModel.account)
+    val discoveryLiveFeedViewModel: NostrDiscoverLiveFeedViewModel = viewModel(
+        key = accountViewModel.userProfile().pubkeyHex + "NostrDiscoveryLiveFeedViewModel",
+        factory = NostrDiscoverLiveFeedViewModel.Factory(accountViewModel.account)
+    )
+
+    val discoveryCommunityFeedViewModel: NostrDiscoverCommunityFeedViewModel = viewModel(
+        key = accountViewModel.userProfile().pubkeyHex + "NostrDiscoveryCommunityFeedViewModel",
+        factory = NostrDiscoverCommunityFeedViewModel.Factory(accountViewModel.account)
+    )
+
+    val discoveryChatFeedViewModel: NostrDiscoverChatFeedViewModel = viewModel(
+        key = accountViewModel.userProfile().pubkeyHex + "NostrDiscoveryChatFeedViewModel",
+        factory = NostrDiscoverChatFeedViewModel.Factory(accountViewModel.account)
     )
 
     val notifFeedViewModel: NotificationViewModel = viewModel(
@@ -137,7 +149,9 @@ fun MainScreen(accountViewModel: AccountViewModel, accountStateViewModel: Accoun
                         videoFeedViewModel.sendToTop()
                     }
                     Route.Discover.base -> {
-                        discoveryFeedViewModel.sendToTop()
+                        discoveryLiveFeedViewModel.sendToTop()
+                        discoveryCommunityFeedViewModel.sendToTop()
+                        discoveryChatFeedViewModel.sendToTop()
                     }
                     Route.Notification.base -> {
                         notifFeedViewModel.invalidateDataAndSendToTop()
@@ -186,7 +200,9 @@ fun MainScreen(accountViewModel: AccountViewModel, accountStateViewModel: Accoun
                     knownFeedViewModel = knownFeedViewModel,
                     newFeedViewModel = newFeedViewModel,
                     videoFeedViewModel = videoFeedViewModel,
-                    discoveryFeedViewModel = discoveryFeedViewModel,
+                    discoveryLiveFeedViewModel = discoveryLiveFeedViewModel,
+                    discoveryCommunityFeedViewModel = discoveryCommunityFeedViewModel,
+                    discoveryChatFeedViewModel = discoveryChatFeedViewModel,
                     notifFeedViewModel = notifFeedViewModel,
                     userReactionsStatsModel = userReactionsStatsModel,
                     navController = navController,

app/src/main/res/values/strings.xml

@@ -472,4 +472,8 @@
     <string name="followed_tags">Followed Tags</string>
 
     <string name="relay_setup">Relays</string>
+
+    <string name="discover_live">Live</string>
+    <string name="discover_community">Communities</string>
+    <string name="discover_chat">Chats Groups</string>
 </resources>