Have you been receiving friend requests from people that you're already friends with? Have you also received messages like this one?

Screen shot by Liberty

From everything that I've read today, the best advise that I can share, is to Stop Sharing the Messages, and don't accept a friend request from someone that you're already friends with.You would know if your friends up and decide to re-invent themselves with a new FB profile. It doesn't make any sense when you say it out loud. If you think that your account has been hacked, let Face Book know about it.