5. GSV Capital Investors looking for a way to buy Facebook before it goes public can look no further than Woodside, Calif.-based GSV Capital ( GSVC). GSV Capital buys stakes in private companies that are in the development stage, like a venture capital fund. It acquires positions from the companies themselves and through secondary markets. GSV owns 225,000 shares of Facebook as well as stakes in Twitter, Groupon ( GRPN) and Bloom Energy. Shares of GSV Capital have gained 30.68% this year.