I have a twitter - to follow bands and stuff. They seem to update on there before their websites/myspace.
I don't have a myspace, facebook, or msn. (They take away from school work. Sad, but true.)
I make a facebook for the summer and then delete it for the school year. :)
I have AIM - but I've always had AIM. I don't use it anymore though.
I delete this every so often and remake a new one.
I'm not one for social networking.