Facebook CFO Sheryl Sandberg has been busy selling off her stake in Facebook -- netting her about $100 million so far. Sandberg's Facebook fame also helped her sell copies of "Lean In," her March 2013 book about women and work.
Peter Thiel, Facebook's first big investor, also cashed in. Thiel sold off nearly all of his shares in August for a tidy $1 billion.
Zuckerberg, on the other hand, disclosed in September 2012 that he would hold onto his stock for at least another year. Zuckerberg, who held 609.5 million shares as of March 31, sold only enough stock in the IPO to cover his massive tax bill.