Crash alert flag waving

I'm going to stick my neck out a bit, but I don't feel too worried!  I'm going to make a prediction, and describe a hunch:

Hunch:

• The Facebook IPO will mark a market top.  From here the only way is down before eventual bottoming out in the markets.  A major bear market, in other words.

Prediction:

• In 10 years Facebook will be gone, and a $100 billion "worth" of company will have disappeared, together with a lot of peoples' cash and hopes.  The only winners the original share holders who got theirs out.