Now this is just silly. Stock prices are a bet. Sometimes they are more of a sure bet, sometimes they are more of a risk. But the idea that anyone can know exactly what a stock should be priced at for a company in a very dynamic field like facebook is just silly. It's better to point out that facebook's current valuation seems quite high and the risk of investing in facebook right now also seems quite high. But beyond that there are no certainties. Facebook could end up with a trillion dollars a year in net revenue in 10 years, or it could go end up sold to a 3rd party company for a tiny fraction of it's current market cap. We don't know and nobody can know.