I've been thinking about this a lot over the last few days. What would it mean to have a social network (like Dispora) that is decentralized, and independent of corporate ties? Could such a thing exist? Would it take off? Maybe. For now though Waffle, Brent and Marco are right. Social networks will rise and fall. Blogs, and RSS may never be as popular, but they don't have to be.
They're playing the long game.