I'm on Facebook. DH and I joined a couple of summers ago when his son was about to drive across the country with a friend, and said the way to keep in touch was to sign up for Facebook so we could see his updates there, 'cuz that was all the staying in touch he was going to commit to.
I've connected with a bunch of people, and got totally addicted to Lexulous (the reincarnation of Scrabulous). I'm on there most days keeping up with my games, and if I have time I look to see what everyone's up to. I just went and found TCSers on Facebook and joined.