For anyone who's interested: There's a new social networking site called
Atheist Nexus for "Atheists, Agnostics, Brights, Freethinkers, Humanists & Skeptics".
So basically, it's like Myspace or Facebook, but atheist-specific. And you know what that means: None of the obnoxiously religious fundies, chain letters, or groups that you find on other sites!
It's still fairly small (3,759 members as of this moment) but the community seems pretty good and there have been some excellent posts made in groups and on blogs.