I used Facebook for about 9 months, uploaded pictures, contacted old friends and acquaintances -- but finally just got tired of it and quit. I just don't care that much -- too time-consuming, too much flotsam and jetsam.
I do however like Twitter -- I use it to follow things I'm interested in, or want more info about (for example, right now I'm following some Maine travel info sites, because I'm going there this summer.) It is very easy to start and stop following organizations, people, etc. and you don't have to be "friends" with anybody!
