On a serious note, Facebook, Google+, MySpace, ICQ, etc are all pretty much the same in that once a message is deleted, it's gone forever (this is done to open up space on the computers that act as the servers). If this is a message that was sent to you, you may try contacting the sender for a "copy" of the message. CAREFULLY check your Facebook archives though. It is VERY possible that the message may still exist in your account archives. I hope this helps, and I want to apologize for my poor behaviour, with regards to my previous response.