Investors who feel they can't wait to own Facebook can still hedge their risk in a few ways. One approach is to buy in gradually, not purchase your whole stake on the first trading day.
Second, you can use a "limit order" to avoid paying a higher-than-necessary price. For example, if the stock is trading about $42 per share and you choose to buy with a limit of $41, your purchase will occur when the stock dips to that level.
Third, investment advisers say, it's vital to remain well diversified. Be wary of putting more than a few percentage points of your savings into a single stock, especially one that might be at risk of rising on a tide of untethered emotion.
Finally, remember this: Many diversified mutual funds will soon own the stock, so you can end up with a stake in Facebook even if you don't buy it directly.