Revenue is much harder to get than profit. As an ex-consultant, you can always cut cost to achieve better profit margin. Revenue is a different story. You are

Revenue is much harder to get than profit. As an ex-consultant, you can always cut cost to achieve better profit margin. Revenue is a different story. You are right that valuation is on a bet that Facebook's revenue will continue to grow. But judging from past performance, and Facebook is still a startup, I think it's a pretty safe bet (comparing to Twitter anyway!).