Plenty of early investors mde a lot of money off FaceBook's IPO. One of the biggest winners: U2's Bono, whose PE firm invested $90M in the company in 2009. The payback? $1.5 billion. | <a href=http://www.investmentnews.com/article/20120518/BLOG06/120519928>25 largest listed companies: Where Facebook ranks</a> &raquo;
