Bono, leader singer of the Irish rock band U2 is also known for his charity work and global activism. After decades of success as a music star, Bono co-founded a private-equity firm, Elevation Partners, in 2004. The company was named after U2's song Elevation. Elevation Partners has participated in growth equity rounds for tech and media companies like Facebook ( FB), Forbes and Yelp. In fact, Elevation bought $210 million worth of Facebook shares in the social network's pre-IPO days. (below Facebook's current share price). They also invested in Palm. Remember PalmPilots? Elevation just participated in a $38 million round for advertising analytics company MarketShare last week. Many investors have had good things to say about Bono. Charlie O'Donnell worked with Bono when O'Donnell was at the GM ( GM) pension fund. O'Donnell says he was "really impressed with how articulate and thoughtful he was about the state of digital media."