It's an interesting question.
For myself personally, No, I have zero interest in FB, none, and I advise my Family to have the same perspective.
For Business ?? Maybe, what makes me even consider it may be useful isn't about FB as Google +
Check out a chap by the name of Trey Ratcliffe, Does HDR Photography, his Photography isn't exceptional I feel (not keen on HDR), but what amazes me is the chaps ability to be able to sell himself through Media sites such as Google + FB etc, this chap has 4 million Google + followers, and he's turned that into what appears to be a very successful Business.
So it would seem these Social Media sites are big business and an avenue for Both Business and Personal Promotion, My sone was telling me that Psy the guy that does the Gandam thing currently has 2 Billion views on You Tube, if that's not a sign the world is totally nuts I don't know what other proof is needed.