As designed Deleted followers, posts & threads still show in activity stream for all users you follow.

The system caches your news feed, so this is as expected. It essentially tries to avoid changing things you've already seen.
 
Is there a way to change this? Just on our site if a user was to unfollow someone they wouldn't expect the posts to be there. Likewise if a post is deleted the "The requested thread could not be found." message isn't appealing.

Thanks.
 
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