I now have a Facebook account and apparently a couple of friends. As always, no good in my teaching situation - but great for gossiping with staff away from the open ears of students!
Not personally my thing - maybe I'm more anti-social than I thought... but I can see how it has a lot of use for other people. (maybe if I go back to studying next year it might make a difference, if my kids were older) I liked the Facebook interface much more than MySpace. If I WAS going to get into this I would definitely go for Facebook.