According to a source with BusinessInsider.com, Facebook co-founder Eduardo Saverin has sold $500 million worth of Facebook stock on a private market. If you have seen the movie The Social Network, you will know that Saverin was fired from the company and his stock was diluted to less than 0.5%. Frustrated by the stock dilution, Saverin shared his story with The Accidental Billionaires author Ben Mezrich. The Social Network is based on that book. Saverin has been using some of his wealth to invest in other Internet companies such as Jumio and Qwiki.