User Joe deleted the fact that he posted a blog post xyz ( by using the ability to add rss feed via user admin/edit area for activitystream)
However when the site super site admin runs cron the same thing, which was deleted by Joe, again appears in his stream.
Comments
Comment #1
xurizaemonDuplicate (but with patch, so let's kill this issue instead): #736406: Don't import items if they've been previously imported and deleted
Would love if you can come review the other issue ;)