Facebook will be worth $100 billion by the time it goes public, sources told the Wall Street Journal, after earning more than $2 billion this year before interest, taxes, depreciation and amortization. Who knew Americans' personal information was so valuable?

Then again, maybe it's not. Sure, Facebook is on track to do an insane $4 billion in revenue this year, according to multiple reports. But some of the social network's early investors are trying to cash out, concerned with how quickly Facebook's valuation has spiked (it has shot from $50 billion in January to $80 billion in some recent trades). And it might just be those same pessimists who are helping to hype the privately-traded stock now, in order to jack the price up. That's classic bubble behavior. Just imagine how insane things are going to get when Facebook actually goes public.

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