Facebook stock is now down 45 percent from what its first buyers paid for it. So if someone bought $10,000 worth of stock it is now worth $5,500. Yikes. If you start adding zeros to those numbers it becomes real money. I almost dared not open my mouth when in a conversation months ago someone was wondering how to get his hands on some Facebook stock once it became public. But I could not refrain, though I said merely that he ought to think about it before investing.