Will everyone abandon Facebook en masse, just like they did AOL and Myspace? Or did Facebook really win?
Will Google finally do something interesting in the space?
Will any of these open source distributed/federated interoperative social networks catch on? All of them?
I sort of hope for a combination the last two. It doesn't look like any of the big players have an incentive to open up and become interoperable, and it doesn't look like any of the new open/distributed upstarts are getting any sort of real traction. Google's the only big player that has a history of demonstrating a willingness to push open/distributed/interoperable data because an open web is a crawlable web is an advertisable web.
Once the social networking/identity thing is more open and distributed, I imagine networks like Facebook becoming more like a place to go to hang out with certain people and share certain things, with various other places for different contexts and different appropriate activities, and different degrees of privacy, but all working from a single, centralized identity.