另一潜在风险：年底前大量解禁股

As of now, 462 million shares are in the float, according to Bloomberg.

On August 15, 268 million shares will come on the market.

Between October 14 and November 12, another 247 million shares will be on the the way.

On November 13, 1.349 billion shares hit. On December 13, an additional 123 million shares hit.

And finally, on May 13, 2013, another 47 million shares will be added.

So that's a total of two billion shares -- over four times the current float -- coming onto the market within a year -- unless, of course, Facebook insiders decide to exercise and hold.