To be quite honest, those valuations are probably way WAY to high. After all, Facebook just went public so that 100 billion dollar valuation is probably stretching it since companies are starting realize that Facebook adds generate little value.

Its good that you have a sense of perspective about this and you don't let the money aspect go to your head. After all, I find it enormously grotesque that these Internet companies are valued so high since one change of management or one new thing can make you become obsolete (MySpace and Yahoo are good examples).

Don't let it get to you, the whole point is that you have your own business and its still there. You can also just think of it as $100 billion of inflated currency. (21.8% to be exact when Facebook was created in 2004 to now).