I wonder where the future of 'social' is going. If history is any guide, Facebook will soon be out of the 'cool' factor and younger, nimbler startups with take over. It's not clear to me though what kind of experience these will provide, i.e., what features will attract the next generation and form that critical mass. I do like the social app ecosystem to be fragmented though, it makes for good options and interesting new ideas to be tested.
I think Facebook is already out of the 'cool' factor and has been for a long-time. It has become, as Zuckerberg also likes to point out, a utility. Cool things and fads die out (a la MySpace).
