diff --git a/src/activitypub/feps.js b/src/activitypub/feps.js
index bfed682671..4cb0b8821c 100644
--- a/src/activitypub/feps.js
+++ b/src/activitypub/feps.js
@@ -25,7 +25,7 @@ Feps.announce = async function announce(id, activity) {
 		followers.unshift(actor);
 	}
 
-	winston.info(`[activitypub/inbox.announce(1b12)] Announcing ${activity.type} to followers of cid ${cid}`);
+	activitypub.helpers.log(`[activitypub/inbox.announce(1b12)] Announcing ${activity.type} (${activity.id}) to followers of cid ${cid}`);
 	await Promise.all([activity, activity.object].map(async (object) => {
 		await activitypub.send('cid', cid, followers, {
 			id: `${nconf.get('url')}/post/${encodeURIComponent(id)}#activity/announce/${Date.now()}`,
@@ -37,3 +37,31 @@ Feps.announce = async function announce(id, activity) {
 		});
 	}));
 };
+
+Feps.announceObject = async function announceObject(id) {
+	let localId;
+	if (String(id).startsWith(nconf.get('url'))) {
+		({ id: localId } = await activitypub.helpers.resolveLocalId(id));
+	}
+	const cid = await posts.getCidByPid(localId || id);
+
+	const followers = await activitypub.notes.getCategoryFollowers(cid);
+	if (!followers.length) {
+		return;
+	}
+
+	const author = await posts.getPostField(id, 'uid');
+	if (!author.startsWith(nconf.get('url'))) {
+		followers.unshift(author);
+	}
+
+	activitypub.helpers.log(`[activitypub/inbox.announce(1b12)] Announcing object (${id}) to followers of cid ${cid}`);
+	await activitypub.send('cid', cid, followers, {
+		id: `${nconf.get('url')}/post/${encodeURIComponent(id)}#activity/announce/${Date.now()}`,
+		type: 'Announce',
+		actor: `${nconf.get('url')}/category/${cid}`,
+		to: [`${nconf.get('url')}/category/${cid}/followers`],
+		cc: [author, activitypub._constants.publicAddress],
+		object: id,
+	});
+};
diff --git a/src/api/topics.js b/src/api/topics.js
index b9066786a0..f1e9f9408a 100644
--- a/src/api/topics.js
+++ b/src/api/topics.js
@@ -10,6 +10,7 @@ const meta = require('../meta');
 const privileges = require('../privileges');
 const events = require('../events');
 const batch = require('../batch');
+const activitypub = require('../activitypub');
 
 const activitypubApi = require('./activitypub');
 const apiHelpers = require('./helpers');
@@ -327,7 +328,7 @@ topicsAPI.move = async (caller, { tid, cid }) => {
 			if (!canMove) {
 				throw new Error('[[error:no-privileges]]');
 			}
-			const topicData = await topics.getTopicFields(tid, ['tid', 'cid', 'slug', 'deleted']);
+			const topicData = await topics.getTopicFields(tid, ['tid', 'cid', 'mainPid', 'slug', 'deleted']);
 			if (!cids.includes(topicData.cid)) {
 				cids.push(topicData.cid);
 			}
@@ -341,6 +342,7 @@ topicsAPI.move = async (caller, { tid, cid }) => {
 			if (!topicData.deleted) {
 				socketHelpers.sendNotificationToTopicOwner(tid, caller.uid, 'move', 'notifications:moved-your-topic');
 				activitypubApi.announce.note(caller, { tid });
+				activitypub.feps.announceObject(topicData.mainPid);
 			}
 
 			await events.log({