Facebook has "demand". Once you have that the rest is just keeping your head on your shoulders. 500 million users and still counting. It would be interesting to see the number of internet users in the world, I think might become their biggest problem. Can you monetize each user more, maybe not a whole lot more without pissing 'em off, but 1c more per user for almost a billion users (should happen soon) is helluva lot.

Basically, a lot of people DONT wanna be on facebook, they probably detest the very idea! But they ARE! As a business owner what else could you want? And would someone pay $33b to get 500 million+ users, Absolutely!