Share your insights or perspective on the financial matter presented in the input.

How does one value Facebook stock as a potential investment?
In the long term, a P/E of 15-25 is the more 'normal' range. With a 90 P/E, Facebook has to quadruple its earnings to get to normal. It this possible? Yes. Likely? I don't know.  I am not a stock analyst, but I love numbers and try to get to logical conclusions. I've seen data that worldwide advertising is about $400B, and US about $100B. If Facebook's profit runs 25% or so and I want a P/E of 20, it needs profit of $5B on sales of $20B (to reconcile its current $100B market cap). No matter what FB growth in sales is, the advertising spent worldwide will not rise or fall by much more than the economy. So with a focus on ads, they would need about 5% of the world market to grow into a comfortable P/E.  Flipping this around, if all advertising were 25% profit (a crazy assumption), there are $100B in profit to be had world wide each year, and the value of the companies might total $2T in aggregate.    The above is a rambling sharing of the reasonable bounds one might expect in analyzing a stock. It can be used for any otherwise finite market, such as soft drinks. There are only so many people on the planet, and in aggregate, the total soft drink consumption can't exceed, say 6 billion gallons per day. The pie may grow a bit, but it's considered fixed as an order of magnitude.   Edit - for what it's worth, as of 8/3/12, the price has dropped significantly, currently $20, and the P/E is showing as 70X. I'm not making any predictions, but the stock needs a combined higher earnings or lower valuation to still approach 'normal.'