pigrabbitbear writes: "For the past eight years, Facebook has been the central neural network of the Internet’s link-sharing brain. But as the site has grown, so have our needs. Now that the company’s public, it’s crunch time, and the skeptics and haters are lining up to talk about how it might all end. One thing’s for certain: whether it’s a bang or a whimper, Facebook is not forever. How could it collapse? Let me count the ways."