Sure, but the actual amount of real money which has ever changed hands for facebook stock is tiny compared to the $50 billion valuation. Besides, even $50 bill

Sure, but the actual amount of real money which has ever changed hands for facebook stock is tiny compared to the $50 billion valuation. Besides, even $50 billion is only equivalent to a fifty-buck-a-share swing in the price of AAPL, something that seems to happen every couple of months. So the total amount of money floating around in this bubble is tiny; nothing to be concerned about unless it's your money.