Yes, but as someone said, "the market can stay irrational longer than you can stay solvent".
John Maynard Keynes said that.
Thanks for the heads up! I thought it was some anonymous on Twitter ;)
... and I hope he's being sarcastic.
This is an article speculating which direction Facebook's stock is going to go in the coming months and years. The efficient-market hypothesis is about as relevant to that as prayer.