Facebooks whole shtick is making you feel like your being social. In reality you are partaking in the most superficial 'fast food' social needs scratching imaginable. This causes people to become addicted to a constant stream of ultimately unsatisfying validation at the cost of spending time on meaningful relationships.
That's a good pull quote to keep up your sleeve: Facebook is the McDonald's of the internet. It's unhealthy and kinda crap but everybody consumes it, and the ones who don't seem stuck up for some reason.
So, in this thread, I already learned that Facebook is AOL 2.0, and also the McDonald's of the Internet. Does anyone have other good analogies for Facebook that they want to share? :)