As Facebook began trading, Proud's site was predicting an average closing price of $54, based on 2,251 predictions on Twitter. At that price, Facebook would have a total market valuation of $148 billion. That would be a nice one-day bump of $44 billion from the announced opening price of $38 a share.
Among some of the notable predictions: Sacca himself predicts a closing price of $56, while John Perry Barlow of Grateful Dead and Electronic Frontier Foundation fame predicts the stock will close at a paltry $32. Ouch.
Within minutes of the start of trading, the price of Facebook began to fall. We shall see if the optimism of the Twitter crowd plays out or not over the next few hours.