Well I guess this means I'm going to have to start spending time on Facebook. I don't really see anything else as compelling as FF on the horizon. I just logged into FB for the first time in about 3 weeks. I had 34 or so friend requests to approve and a ton of facebook email that I'm still wading through now. Sigh.
A big lesson we should be learning from the Twitter experience: Putting all our eggs in one basket is a bad idea. Twitter has too much power and it's just a corporation, with limited abilities and lots of interests that aren't aligned with those of users. The web is not like that. More in comments..