Facebook users in recent days have been plagued by old chats in Messenger. Without any rhyme or reason, many have been seeing year-old conversations pop up at the top of their chat list as unread items. This, of course, has caused much unneeded confusion (and even unpleasant emotions) among the affected.

But users are concerned not only because they are seeing conversations from years ago that they'd much rather forget, but for privacy reasons as well. Facebook, however, says there's nothing to worry about, and that that Messenger's unusual behavior is the result of a bug caused ...