Unfortunately for most of them,MBT scarpe, they only remain filthy rich in their dreams. What with the competition for top-ranked software engineers keener than ever, Facebook needs to be able to offer the same coin of the realm as its publicly-held rivals. The hang-up is that employees who joined before fall 2007 could only sell their stock on secondary markets if they quit the company. Facebook employees who joined after fall 2007 received restricted stock which they can cash in only after Facebook holds its IPO.