This is a great idea for Facebook! They're in the perfect position to have widespread adoption quickly and the service would be invaluable. Privacy would be key though, they'd have to opensource it and prove to people that it's secure and private.
Won't happen, I've been waiting for them to become like MySpace but it just hasn't happened.
Facebook is the best at social media, there's no denying that. I would support them if they would have stayed small, simple, and private, but they kept adding, tracking, Sharing, Liking, Poking, etc.
