jboydyhacker, You're right that different companies have different growth rates at various stages. But, to me, it still doesn't add up. From another comment I

jboydyhacker, You're right that different companies have different growth rates at various stages. But, to me, it still doesn't add up. From another comment I made below: "I understand the argument about growth, but even from that end, it doesn't completely stand up. If we were to use the PEG Ratio (http://en.wikipedia.org/wiki/PEG_ratio http://en.wikipedia.org/wiki/PEG_ratio), for Facebook to be fairly valued at $50B, it has to grow its Net Income by 100% annually, on average over the next five years. It's possible Facebook might be able to do that next year, but then it'll have 1 billion users. That's 14% of the world's population. That's huge. Being generous though, let's extend that 100% growth into the year after. Then, Facebook would have 2 billion users, 28% of the world's population, and assuming current margins, they would only be eeking out $2 billion in profit. Will it be worth $200 billion then? I would say no and I would say Facebook's not worth $50 billion now."