diff --git a/src/components/CreatePost/PostEditor.vue b/src/components/CreatePost/PostEditor.vue
index 5d88696..dad551b 100644
--- a/src/components/CreatePost/PostEditor.vue
+++ b/src/components/CreatePost/PostEditor.vue
@@ -52,7 +52,7 @@ import BaseIcon from 'components/BaseIcon/index.vue'
 import EmojiPicker from 'components/CreatePost/EmojiPicker.vue'
 import {useAppStore} from 'stores/App'
 import {useNostrStore} from 'src/nostr/NostrStore'
-import Event, {EventKind} from 'src/nostr/model/Event'
+import EventBuilder from 'src/nostr/EventBuilder'
 
 export default {
   name: 'PostEditor',
@@ -112,35 +112,13 @@ export default {
     reset() {
       this.content = ''
     },
-    buildEvent() {
-      return Event.fresh({
-        pubkey: this.app.myPubkey,
-        kind: EventKind.NOTE,
-        tags: this.buildTags(),
-        content: this.content,
-      })
-    },
-    buildTags() {
-      // TODO Extract tags from content
-      const e = []
-      const p = []
-
-      if (this.ancestor) {
-        if (this.ancestor.hasAncestor()) {
-          e.push(this.ancestor.root())
-        }
-        e.push(this.ancestor.id)
-        p.push(this.ancestor.author)
-      }
-
-      return e.map(e => ['e', e])
-        .concat(p.map(p => ['p', p]))
-    },
     async publishPost() {
       this.publishing = true
       try {
-        const event = this.buildEvent()
-        await this.app.signEvent(event)
+        const event = this.ancestor
+          ? EventBuilder.reply(this.ancestor, this.app.myPubkey, this.content).build()
+          : EventBuilder.post(this.app.myPubkey, this.content).build()
+        if (!await this.app.signEvent(event)) return
         this.nostr.publish(event)
 
         this.reset()
@@ -153,6 +131,7 @@ export default {
           color: 'positive',
         })
       } catch (e) {
+        console.error('Failed to publish post', e)
         this.$q.notify({
           message: `Failed to publish post`,
           color: 'negative'
diff --git a/src/components/Settings/ProfileSettings.vue b/src/components/Settings/ProfileSettings.vue
index 2f70416..7ade864 100644
--- a/src/components/Settings/ProfileSettings.vue
+++ b/src/components/Settings/ProfileSettings.vue
@@ -25,8 +25,8 @@
 <script>
 import {useNostrStore} from 'src/nostr/NostrStore'
 import {useAppStore} from 'stores/App'
-import Event, {EventKind} from 'src/nostr/model/Event'
 import Nip05 from 'src/utils/Nip05'
+import EventBuilder from 'src/nostr/EventBuilder'
 
 export default {
   name: 'ProfileSettings',
@@ -70,17 +70,14 @@ export default {
       this.verified = this.profile?.nip05.verified
     },
     async updateProfile() {
-      const event = Event.fresh({
-        pubkey: this.pubkey,
-        kind: EventKind.METADATA,
-        content: JSON.stringify({
-          name: this.name || undefined,
-          about: this.about || undefined,
-          picture: this.picture || undefined,
-          nip05: this.nip05 || undefined,
-        })
-      })
-      await this.app.signEvent(event)
+      const metadata = {
+        name: this.name || undefined,
+        about: this.about || undefined,
+        picture: this.picture || undefined,
+        nip05: this.nip05 || undefined,
+      }
+      const event = EventBuilder.metadata(this.pubkey, metadata).build()
+      if (!await this.app.signEvent(event)) return
       this.nostr.publish(event)
     },
   },
diff --git a/src/components/SignIn/SignUpForm.vue b/src/components/SignIn/SignUpForm.vue
index 530b7a9..da1e7a6 100644
--- a/src/components/SignIn/SignUpForm.vue
+++ b/src/components/SignIn/SignUpForm.vue
@@ -14,7 +14,7 @@ import {useAppStore} from 'stores/App'
 import {useNostrStore} from 'src/nostr/NostrStore'
 import {useSettingsStore} from 'stores/Settings'
 import {generatePrivateKey} from 'nostr-tools'
-import Event, {EventKind} from 'src/nostr/model/Event'
+import EventBuilder from 'src/nostr/EventBuilder'
 
 export default {
   name: 'SignUpForm',
@@ -39,13 +39,7 @@ export default {
       const account = settings.addAccount({privkey})
       settings.switchAccount(account.pubkey)
 
-      const event = Event.fresh({
-        pubkey: account.pubkey,
-        kind: EventKind.METADATA,
-        content: JSON.stringify({
-          name: this.username
-        })
-      })
+      const event = EventBuilder.metadata(account.pubkey, {name: this.username}).build()
       await useAppStore().signEvent(event)
       useNostrStore().publish(event)
 
diff --git a/src/components/User/FollowButton.vue b/src/components/User/FollowButton.vue
index 4cf7d6c..9503f84 100644
--- a/src/components/User/FollowButton.vue
+++ b/src/components/User/FollowButton.vue
@@ -12,7 +12,7 @@
 <script>
 import {useNostrStore} from 'src/nostr/NostrStore'
 import {useAppStore} from 'stores/App'
-import Event, {EventKind, TagType} from 'src/nostr/model/Event'
+import EventBuilder from 'src/nostr/EventBuilder'
 
 export default {
   name: 'FollowButton',
@@ -38,25 +38,9 @@ export default {
     },
   },
   methods: {
-    // TODO Move this logic somewhere else
-    buildEvent(contacts) {
-      return Event.fresh({
-        pubkey: this.app.myPubkey,
-        kind: EventKind.CONTACT,
-        tags: this.buildTags(contacts),
-        content: '',
-      })
-    },
-    buildTags(contacts) {
-      const tags = []
-      for (const contact of contacts) {
-        tags.push([TagType.PUBKEY, contact.pubkey])
-      }
-      return tags
-    },
     async updateContacts(contacts) {
-      const event = this.buildEvent(contacts)
-      await this.app.signEvent(event)
+      const event = EventBuilder.contacts(this.app.myPubkey, contacts.map(c => c.pubkey)).build()
+      if (!await this.app.signEvent(event)) return
       this.nostr.publish(event)
     },
     toggleFollow() {
diff --git a/src/nostr/EventBuilder.js b/src/nostr/EventBuilder.js
new file mode 100644
index 0000000..274235a
--- /dev/null
+++ b/src/nostr/EventBuilder.js
@@ -0,0 +1,113 @@
+import Event, {EventKind, TagType} from 'src/nostr/model/Event'
+import DateUtils from 'src/utils/DateUtils'
+
+export default class EventBuilder {
+  constructor(opts) {
+    this.event = new Event({
+      id: opts.id,
+      pubkey: opts.pubkey || opts.author,
+      created_at: opts.created_at || opts.createdAt || DateUtils.now(),
+      kind: opts.kind,
+      tags: opts.tags || [],
+      content: opts.content || '',
+      sig: opts.sig,
+    })
+  }
+
+  static post(author, content) {
+    return new EventBuilder({
+      kind: EventKind.NOTE,
+      pubkey: author,
+      content
+    })
+  }
+
+  static reply(ancestor, author, content) {
+    const tags = []
+
+    // Reference thread root and ancestor
+    const root = ancestor.eventRefs().root()
+    if (root) tags.push([TagType.EVENT, root]) // TODO relay, meta
+    tags.push([TagType.EVENT, ancestor.id]) // TODO relay, meta
+
+    // Tag author of ancestor
+    tags.push([TagType.PUBKEY, ancestor.author])
+
+    return new EventBuilder({
+      kind: EventKind.NOTE,
+      pubkey: author,
+      content,
+      tags,
+    })
+  }
+
+  static reaction(ancestor, author) {
+    const tags = []
+
+    // Reference ancestor
+    tags.push([TagType.EVENT, ancestor.id]) // TODO relay, meta
+
+    // Tag author of ancestor
+    tags.push([TagType.PUBKEY, ancestor.author])
+
+    return new EventBuilder({
+      kind: EventKind.REACTION,
+      pubkey: author,
+      content: '❤️', // TODO default reaction
+      tags,
+    })
+  }
+
+  static metadata(author, metadata) {
+    return new EventBuilder({
+      kind: EventKind.METADATA,
+      pubkey: author,
+      content: JSON.stringify(metadata),
+    })
+  }
+
+  static contacts(author, pubkeys) {
+    const tags = pubkeys.map(pubkey => [TagType.PUBKEY, pubkey])
+    return new EventBuilder({
+      kind: EventKind.CONTACT,
+      pubkey: author,
+      tags
+    })
+  }
+
+  static delete(author, ids) {
+    const tags = ids.map(id => [TagType.EVENT, id])
+    return new EventBuilder({
+      kind: EventKind.DELETE,
+      pubkey: author,
+      tags
+    })
+  }
+
+  createdAt(timestamp) {
+    this.event.created_at = timestamp
+    return this
+  }
+
+  pubkeyTag(pubkey) {
+    this.event.tags.push([TagType.PUBKEY, pubkey])
+    return this
+  }
+
+  eventTag(id, relay = null, meta = null) {
+    const tag = [TagType.EVENT, id]
+    if (relay) tag.push(relay)
+    if (meta) tag.push(meta)
+    this.event.tags.push(tag)
+    return this
+  }
+
+  content(content) {
+    this.event.content = content
+    return this
+  }
+
+  build() {
+    return new Event(this.event)
+  }
+}