Ok, truthfully because it sounds a little childish and bratty to say you'd have to think more deeply about working for a company that doesn't allow you to use the Internet or blocks Facebook. In the real world some companies won't let you even have your cell phone on you when on the clock. You're on the company time, they have every right to dictate what you can and cannot do on the clock.
I just don't like anything really structured. I'm not saying not having facebook would make me want to work for a company less, but rather that would be one possible indication of company culture, among others.