Yep, but it's still a problem for the company. Facebook has been on a hiring spree, backed by an implicit promise that anyone in before the IPO would be practically guaranteed to make a buck. If the IPO is still a bust by the time the lockup expires in 3-6 months, it's going to be an HR problem. Of course, it depends on how Facebook actually structures its compensation packages. RSU are more popular with most companies these days than stock options, so they may just be looking forward to a smaller payday than worthless options.