Have you been following the action on SharesPost and SecondMarket? These exchanges for private company stock have attracted a hefty amount of attention, as they’ve given some insight into the valuations that companies like LinkedIn, Pandora and even Facebook could fetch at an initial public offering. Former employees, especially, have been unloading shares in order to recoup some of what they sacrificed in salary. The dollars flowing through are staggering.

Read More: Twitter and Others to Block Shareholders from SharesPost and SecondMarket