[netcan]

They could. I'm not saying they can't.

But, the chances are probably lower than Facebook failing. The chances of Google failing are much lower than the chances of Facebook growing its revenues (or prospects) 5X.

Price (ie working for shares) is an estimation of probability. I'm not saying Facebook is worthless. It's worth a lot. The reason Facebook's valuation isn't $100b already is because the road from here to there is an uncertain one. The two factors I would consider to be important are: (a) Facebook's revenue model is relatively immature.(b) Facebook might be a trend.

*I think Facebook might even have the potential rival Google in advertising. I'm not a Facebook pessimist.