Facebook is a fad. A damn big one I'll grant you but it's already losing it's grip on the next generation of users. It's huge now but I feel it's already lost it's luster, I mean come on, I'm a huge user (keeping up with friends across states is damn hard otherwise) and I can't stand being on it, and I know a lot of friends who feel the same.
It will have it's time, in due time. Hyperlinks are not dead.