There are people that use it like a "normal" person and depend on it in many cases... you can't stereotype everyone that uses Facebook as some anti-social hermit. Might as well ban video games with that reasoning.
A "normal" person would have no need to use it since they'd be outside talking to people or on the phone.
I see no reason for anyone to depend on facebook apart from the creator since its his income.
They can't kill Facebook, how would we get all that absolutely vital information about what everyone had to drink last night, and how bad their hangovers are today?
This is one of the many things that annoy me about it. They type up before they leave, "Gonna get pure wrecked the night yass" and then predictably the next morning "Aww that was a really bad idea, not doing that again." only to see the next weekend a repeat of what was previously posted, its an endles loop of lies!
They can be that hungover if their able to get onto facebook for hours, maybe its actually the computer thats hurting their heads and not the hangover