diff --git a/public/src/admin/manage/users.js b/public/src/admin/manage/users.js
index 0f8dffaa29..1c338a0975 100644
--- a/public/src/admin/manage/users.js
+++ b/public/src/admin/manage/users.js
@@ -510,7 +510,7 @@ define('admin/manage/users', [
 				if (confirm) {
 					Promise.all(
 						uids.map(
-							uid => api.del(`/users/${uid}${path}`, {}).then(() => {
+							uid => api.del(`/users/${encodeURIComponent(uid)}${path}`, {}).then(() => {
 								if (path !== '/content') {
 									removeRow(uid);
 								}
diff --git a/src/activitypub/actors.js b/src/activitypub/actors.js
index aa093802dd..158ee9b893 100644
--- a/src/activitypub/actors.js
+++ b/src/activitypub/actors.js
@@ -71,6 +71,8 @@ Actors.assert = async (ids, options = {}) => {
 
 	// winston.verbose(`[activitypub/actors] Asserting ${ids.length} actor(s)`);
 
+	// NOTE: MAKE SURE EVERY DB ADDITION HAS A CORRESPONDING REMOVAL IN ACTORS.REMOVE!
+
 	const urlMap = new Map();
 	const followersUrlMap = new Map();
 	const pubKeysMap = new Map();
@@ -207,3 +209,29 @@ Actors.getLocalFollowersCount = async (id) => {
 
 	return await db.sortedSetCard(`followersRemote:${id}`);
 };
+
+Actors.remove = async (id) => {
+	const exists = await db.isSortedSetMember('usersRemote:lastCrawled', id);
+	if (!exists) {
+		return false;
+	}
+
+	let { username, fullname, url, followersUrl } = await user.getUserFields(id, ['username', 'fullname', 'url', 'followersUrl']);
+	username = username.toLowerCase();
+
+	await Promise.all([
+		db.sortedSetRemoveBulk([
+			['ap.preferredUsername:sorted', `${username}:${id}`],
+			['ap.name:sorted', `${fullname.toLowerCase()}:${id}`],
+		]),
+		db.deleteObjectField('handle:uid', username),
+		db.deleteObjectField('followersUrl:uid', followersUrl),
+		db.deleteObjectField('remoteUrl:uid', url),
+		db.delete(`userRemote:${id}:keys`),
+	]);
+
+	await Promise.all([
+		db.delete(`userRemote:${id}`),
+		db.sortedSetRemove('usersRemote:lastCrawled', id),
+	]);
+};
diff --git a/src/api/users.js b/src/api/users.js
index 6b3398db9d..924dd1daa0 100644
--- a/src/api/users.js
+++ b/src/api/users.js
@@ -515,7 +515,7 @@ async function isPrivilegedOrSelfAndPasswordMatch(caller, data) {
 
 async function processDeletion({ uid, method, password, caller }) {
 	const isTargetAdmin = await user.isAdministrator(uid);
-	const isSelf = parseInt(uid, 10) === parseInt(caller.uid, 10);
+	const isSelf = String(uid) === String(caller.uid);
 	const hasAdminPrivilege = await privileges.admin.can('admin:users', caller.uid);
 
 	if (isSelf && meta.config.allowAccountDelete !== 1) {
diff --git a/src/middleware/assert.js b/src/middleware/assert.js
index 67a63b0344..6b20667379 100644
--- a/src/middleware/assert.js
+++ b/src/middleware/assert.js
@@ -29,8 +29,8 @@ Assert.user = helpers.try(async (req, res, next) => {
 	const uid = req.params.uid || res.locals.uid;
 
 	if (
-		(utils.isNumber(uid) && await user.exists(uid)) ||
-		(uid.indexOf('@') !== -1 && await activitypub.helpers.query(uid))
+		((utils.isNumber(uid) || activitypub.helpers.isUri(uid)) && await user.exists(uid)) ||
+		(uid.indexOf('@') !== -1 && await user.existsBySlug(uid))
 	) {
 		return next();
 	}
diff --git a/src/user/delete.js b/src/user/delete.js
index 9efd8802ae..c6eb13809f 100644
--- a/src/user/delete.js
+++ b/src/user/delete.js
@@ -13,7 +13,9 @@ const topics = require('../topics');
 const groups = require('../groups');
 const messaging = require('../messaging');
 const plugins = require('../plugins');
+const activitypub = require('../activitypub');
 const batch = require('../batch');
+const utils = require('../utils');
 
 module.exports = function (User) {
 	const deletesInProgress = {};
@@ -24,7 +26,7 @@ module.exports = function (User) {
 	};
 
 	User.deleteContent = async function (callerUid, uid) {
-		if (parseInt(uid, 10) <= 0) {
+		if (utils.isNumber(uid) && parseInt(uid, 10) <= 0) {
 			throw new Error('[[error:invalid-uid]]');
 		}
 		if (deletesInProgress[uid]) {
@@ -61,7 +63,7 @@ module.exports = function (User) {
 		let deleteIds = [];
 		await batch.processSortedSet('post:queue', async (ids) => {
 			const data = await db.getObjects(ids.map(id => `post:queue:${id}`));
-			const userQueuedIds = data.filter(d => parseInt(d.uid, 10) === parseInt(uid, 10)).map(d => d.id);
+			const userQueuedIds = data.filter(d => String(d.uid) === String(uid)).map(d => d.id);
 			deleteIds = deleteIds.concat(userQueuedIds);
 		}, { batch: 500 });
 		await async.eachSeries(deleteIds, posts.removeFromQueue);
@@ -90,7 +92,7 @@ module.exports = function (User) {
 		deletesInProgress[uid] = 'user.deleteAccount';
 
 		await removeFromSortedSets(uid);
-		const userData = await db.getObject(`user:${uid}`);
+		const userData = await db.getObject(utils.isNumber(uid) ? `user:${uid}` : `userRemote:${uid}`);
 
 		if (!userData || !userData.username) {
 			delete deletesInProgress[uid];
@@ -153,6 +155,7 @@ module.exports = function (User) {
 			flags.resolveFlag('user', uid, uid),
 			User.reset.cleanByUid(uid),
 			User.email.expireValidation(uid),
+			activitypub.actors.remove(uid),
 		]);
 		await db.deleteAll([
 			`followers:${uid}`, `following:${uid}`, `user:${uid}`,