LinkedIn more than doubles value

LinkedIn went public at $49 a share yesterday morning, and at the end of the trading day it was up to $98.25.

At that stock price, LinkedIn is now worth...are you ready for this...$8.91 billion, or about 24 times 2011 revenue.

If I was one of LinkedIn's founders, I'd pull a Mark Cuban and sell it all now. Settle for a billion or two and get out of there before everyone realizes what they've done.