I don't think anyone would seriously buy based on the current figures. If you buy Facebook today, you're hoping for exponential growth over the next few years, at which point you can either sell at a profit or take dividends (if Facebook ever pay them - US technology companies don't tend to pay out much).

If you want a return now, you could just buy shares in a utility company for a fraction of the price, since they already make multi-billion pound/dollar profits and distribute large chunks to shareholders.