Just to be clear, I don't think they're going to go under as a company (edit: financially). By "collapse," I mean they're going to lose their relevance. The overvaluing of their IPO (and I feel their stock is still overvalued) is just one sign among many that I feel show it's not worth all the hype surrounding it. The problem is, FB doesn't know how to adapt. It's only one in a long line of social network, and it won't be the last. Or best.