I'm a freelance advertising writer. I move from workplace to workplace regularly. When a [temporary] co-worker "friends" me on facebook I feel...panicky. Guilty. Caught. Locked in. And then, I realize - who cares?
I find the more interesting people I know are quietly talking, gathering (conversion rates aren't that high and I suspect won't ever be) in a small little corner on the web. It's nice to have a quiet place to gather. Why +er not?