My view of Facebook is;
Those who came up with Facebook had every intention of pulling everyone they possibly could away from all the public media bases, (Forms, open Blogs, and whatever the others may be or were) without any regard to the content material (good or bad) being posted on Facebook user posts...
So, in this sue happy world - who's responsible for the wrong information? Facebook, the Forum supporting Facebook, the Facebook user? Well, there's a very good chance it could be ruled (if it ever happened - the latter two) because they (Facebook) have the bucks to buy the Attorneys needed to sell their innocence of any incident that may happen in the future.
I could go on but I think we all get the idea... The little guy is the one that's going to get the blame, and have to pay the piper... Not Facebook...