Social Sites

Chris Brogan posted a list of application sites from blogging to social searching that makes me feel a little older. I know I am not of the social net generation, but at times I like to pretend that I am. I wonder which of the apps on this list students at Kirkwood favor? I only ever see students using Facebook when I pass by the kiosks in Linn Hall, but which of these other sites might be most useful? I'm toying with the idea of setting up a twitter account for Distance Learning. Not sure though what kind of updates I would have on a daily basis. Might be fun to try though.