I made a myspace once because I wanted to see some pictures my friends made. Granted I made it for my WoW character at the time, but I'm pretty sure I still have one.

I don't have an active facebook. I tried it for four days but didn't like having my first and last name along with location and such so readily available on the internet, even with all the security options. I deleted it as soon as one of my 'net friends found me.

It's a bit of a social impediment since all my social information actually has to be gathered from conversation, but so far I've yet to be too bitter.