I don't have facebook. Everyone that counts to me is in my life already. What do I need with a bunch of dipwads from past years tracking me down and 'friending' me? Putting one's life on the internet strikes me as weird. I enjoy my anonymity.
It's a part of the lifestyle of the upcoming generation who are in their teens and 20s now. Conceptually, it's no different than Getbig, except it has the opposite kind of atmosphere where everyone is nice to each other (for most parts), since it's just people having online conversations with their friends and sharing stuff like pics and related interests.
As with Getbig and other forums, there are those who post trivial, mindless shit, but that's what it is for. The friend finder thing is a big plus for lots of people, since it lets them find people they've fallen out of touch with. It also allows businesses to easily interact with and engage their clientele and prospects for pretty much zero cost and little effort, and is a lot more effective than media advertising. Facebook is HUGE and here to stay.
I still love Getbig and prefer killing time here, though
I never post in FB.