diff --git a/src/api/activitypub.js b/src/api/activitypub.js
index 7e4ae7da18..19e9087539 100644
--- a/src/api/activitypub.js
+++ b/src/api/activitypub.js
@@ -350,7 +350,7 @@ activitypubApi.announce = {};
 activitypubApi.announce.note = enabledCheck(async (caller, { tid }) => {
 	const { mainPid: pid, cid } = await topics.getTopicFields(tid, ['mainPid', 'cid']);
 
-	// Only remote posts can be announced to real categories
+	// Only remote posts can be announced to local categories
 	if (utils.isNumber(pid) || parseInt(cid, 10) === -1) {
 		return;
 	}
@@ -379,6 +379,63 @@ activitypubApi.announce.note = enabledCheck(async (caller, { tid }) => {
 	});
 });
 
+activitypubApi.announce.delete = enabledCheck(async ({ uid }, { tid }) => {
+	const now = new Date();
+	const { mainPid: pid, cid } = await topics.getTopicFields(tid, ['mainPid', 'cid']);
+
+	// Only local categories
+	if (!utils.isNumber(cid) || parseInt(cid, 10) < 1) {
+		return;
+	}
+
+	const allowed = await privileges.categories.can('topics:read', cid, activitypub._constants.uid);
+	if (!allowed) {
+		activitypub.helpers.log(`[activitypub/api] Not federating announce of pid ${pid} to the fediverse due to privileges.`);
+		return;
+	}
+
+	const { to, cc, targets } = await activitypub.buildRecipients({
+		to: [activitypub._constants.publicAddress],
+		cc: [`${nconf.get('url')}/category/${cid}/followers`],
+	}, { cid });
+
+	const deleteTpl = {
+		id: `${nconf.get('url')}/topic/${tid}#activity/delete/${now.getTime()}`,
+		type: 'Delete',
+		actor: `${nconf.get('url')}/category/${cid}`,
+		to,
+		cc,
+		origin: `${nconf.get('url')}/category/${cid}`,
+	};
+
+	// 7888 variant
+	await activitypub.send('cid', cid, Array.from(targets), {
+		id: `${nconf.get('url')}/topic/${tid}#activity/announce/delete/${now.getTime()}`,
+		type: 'Announce',
+		actor: `${nconf.get('url')}/category/${cid}`,
+		to,
+		cc,
+		object: {
+			...deleteTpl,
+			object: `${nconf.get('url')}/topic/${tid}`,
+		},
+	});
+
+	// 1b12 variant
+	await activitypub.send('cid', cid, Array.from(targets), {
+		id: `${nconf.get('url')}/post/${encodeURIComponent(pid)}#activity/announce/delete/${now.getTime()}`,
+		type: 'Announce',
+		actor: `${nconf.get('url')}/category/${cid}`,
+		to,
+		cc,
+		object: {
+			...deleteTpl,
+			actor: `${nconf.get('url')}/uid/${uid}`,
+			object: utils.isNumber(pid) ? `${nconf.get('url')}/post/${pid}` : pid,
+		},
+	});
+});
+
 activitypubApi.undo = {};
 
 // activitypubApi.undo.follow =
diff --git a/src/posts/delete.js b/src/posts/delete.js
index 5668ac3750..dddb33e6a9 100644
--- a/src/posts/delete.js
+++ b/src/posts/delete.js
@@ -34,6 +34,7 @@ module.exports = function (Posts) {
 		await Promise.all([
 			topics.updateLastPostTimeFromLastPid(postData.tid),
 			topics.updateTeaser(postData.tid),
+			isDeleting ? activitypub.notes.delete(pid) : null,
 			isDeleting ?
 				db.sortedSetRemove(`cid:${topicData.cid}:pids`, pid) :
 				db.sortedSetAdd(`cid:${topicData.cid}:pids`, postData.timestamp, pid),
diff --git a/src/topics/delete.js b/src/topics/delete.js
index e97fd0a98e..d07a3aee5b 100644
--- a/src/topics/delete.js
+++ b/src/topics/delete.js
@@ -8,6 +8,7 @@ const categories = require('../categories');
 const flags = require('../flags');
 const plugins = require('../plugins');
 const batch = require('../batch');
+const api = require('../api');
 const utils = require('../utils');
 
 module.exports = function (Topics) {
@@ -80,6 +81,7 @@ module.exports = function (Topics) {
 		}
 		deletedTopic.tags = tags;
 		await deleteFromFollowersIgnorers(tid);
+		await api.activitypub.announce.delete({ uid }, { tid }),
 
 		await Promise.all([
 			db.deleteAll([
diff --git a/src/topics/tools.js b/src/topics/tools.js
index 294615b38a..65505bde67 100644
--- a/src/topics/tools.js
+++ b/src/topics/tools.js
@@ -7,6 +7,7 @@ const topics = require('.');
 const categories = require('../categories');
 const user = require('../user');
 const plugins = require('../plugins');
+const api = require('../api');
 const privileges = require('../privileges');
 const utils = require('../utils');
 
@@ -277,6 +278,13 @@ module.exports = function (Topics) {
 		const oldCid = topicData.cid;
 		await categories.moveRecentReplies(tid, oldCid, cid);
 
+		// AP: Announce(Delete(Object))
+		if (cid === -1) {
+			await api.activitypub.announce.delete({ uid: data.uid }, { tid });
+		} else {
+			// tbd: api.activitypub.announce.move
+		}
+
 		await Promise.all([
 			Topics.setTopicFields(tid, {
 				cid: cid,