To tell the truth, I was on Facebook for a couple of months. I don't know why, except Preacher at my old job said I should try it. I got two pings from old high school buddies, whom I hadn't seen since high school, and a bunch of invites to friend my students, and play Mafia Wars.
I pretty much ignored it, until Wiley came out with this cartoon:
...which, I think, pretty much says it all. I closed my account, and shall not return.
Click on the post title to read Matt Labash's take.
I agree whole-heartedly.