If current investors weren't satisfied with current income, they would sell. Facebook's margins are excellent, and while I will agree their P/E ratio is high, G

If current investors weren't satisfied with current income, they would sell. Facebook's margins are excellent, and while I will agree their P/E ratio is high, Google's is quite near that of GE (which should have a much lower multiple considering their return on assets is MUCH lower). I'm sure it will happen eventually, but tech companies are making money right now, and they aren't built on broken economics like the dot com bust in 99. I guess while I agree there is a bubble in startup valuations, I do not think Google, FB, and friends are at huge risk of going bankrupt or losing a substantial portion of their enterprise values.