You've probably read The New York Timesarticle, The Facebook Resisters. One of the "resisters" struck me as kind of weird:
Tyson Balcomb quit Facebook after a chance encounter on an elevator. He found himself standing next to a woman he had never met — yet through Facebook he knew what her older brother looked like, that she was from a tiny island off the coast of Washington and that she had recently visited the Space Needle in Seattle. “I knew all these things about her, but I’d never even talked to her,” said Mr. Balcomb, a pre-med student in Oregon who had some real-life friends in common with the woman. “At that point I thought, maybe this is a little unhealthy.”
Is this really novel? Haven't you heard all about people on some occasions and just happened never to run into them? I think the big deal is confusing social networking technologies as a qualitative difference when they're quantitative. They extend, they don't transform. And it isn't as if Facebook is special. You can find all sorts of things about Tyson Balcomb online.