Who stands to really get rich off the Facebook IPO U2's Bono's investment group reportedly spent $120 million for 5 million Facebook shares on the secondary market in 2010. By Mary Catherine Wellons, CNBC.com Facebook now boasts more than 800 million users, but its investors make up a much more exclusive group. With the company expected to go public at a valuation of more than $100 billion, these early investors stand to cash in on the social network's success. Below, meet the angels, venture capitalists, and global investors who have made big bets on Facebook: Peter Thiel Peter Thiel, a venture capitalist and entrepreneur, invested in Facebook in 2004 as an angel investor. Thiel also serves on Facebook's board of directors. He's a co-founder of PayPal, which he sold to eBay in 2002. Thiel also heads up the Founders Fund with PayPal partners Ken Howery and Luke Nosek. Reid Hoffman Reid Hoffman is an angel investor in Facebook and many other companies, including Flickr, Last.fm, Ning, and Zynga. Hoffman is a partner at Greylock and co-founder and executive chairman at LinkedIn. Jim Breyer Accel Partners" Jim Breyer invested in Facebook in April 2005, and also serves on the company's board. Breyer ranked No. 1 on this year's Forbes Midas List of top 10 investors. CNBC.com: Inside Facebook headquarters Mark Pincus Mark Pincus is the founder and CEO of Zynga, the world's leading social game developer. Pincus invested in Facebook in 2005. Meritech Capital Partners Meritech Capital Partners is a private-equity firm focused on late stage venture capital investments in information technology. Meritech participated in Facebook's Series B funding round in April 2006. Microsoft On Oct. 24, 2007, Microsoft took a $240 million equity stake in Facebook as part of an expanded advertising partnership. Microsoft was the sole participant in Facebook's Series C financing round. CNBC.com: Who Are the Under-the-Radar Facebook Investors? Li Ka-shing Hong Kong billionaire Li Ka-shing made a reported $60 million investment in Facebook in November 2007. Li is the chairman of Cheung Kong Holdings and Hutchison Whampoa. European Founders Fund German entrepreneurs Alexander, Marc and Oliver Samwer invested in Facebook in January 2008 as part of a $15 billion valuation round with Microsoft. The brothers reportedly sold their shares earlier this year. Digital Sky Technologies (Yuri Milner) Yuri Milner's Digital Sky Technologies made a $200 million investment in Facebook on May 26, 2009, in exchange for preferred stock. At the time, the investment represented a 1.96 percent equity stake at a $10 billion valuation. The company also participated in a $500 million direct investment in Facebook alongside Goldman Sachs at a $50 billion valuation. Elevation Partners Elevation Partners reportedly spent $120 million for 5 million Facebook shares on the secondary market back in June 2010. This investment came on top of Elevation's purchase of 2.5 million shares in November 2009. Elevation Partners was co-founded by U2 frontman Bono. Goldman Sachs Goldman Sachs invested $1 billion in Facebook Class A common stock on Jan. 21 as part of an overseas offering. Digital Sky Technologies and Goldman Sachs also invested $500 million in Facebook Class A common stock in December 2010.