"I would short $FBOOK, not because of the company's fundamentals, but because of fundamentals in the market for their shares. Currently, it's only possible to express one opinion of $FBOOK: bullish. The only selling pressure exerted on the stock comes from the company issuing shares (and insiders cashing out their shares). Until there's a mechanism for third parties to express, and participate in, the bearish case for $FBOOK, there's nothing keeping its valuation at a sober equilibrium." - Matt Copenhaver