Facebook if I had to choose.
Since starting University, I've more or less had a falling out with people I don't see on a daily basis (i.e..pretty much everyone). So I use Facebook to keep in contact with all my friends from High School, older friends from AF, the girlfriend and my guildies. I just come to AF to poke around out of curiousity. I spent so much time here just a couple of years ago.
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