... and remember guys, the stock price is just what the public is willing to pay for it, and is not directly bound by any fundamentals. It's not LinkedIn's fault that their stock is overvalued.
You may say it's not their fault, but if you log in to LinkedIn today you'll notice that all of the "news" articles - now placed in an even more prominent position than normal - are about how underpriced their stock is. Entirely coincidentally, I'm sure.