For years, U2 frontman Bono has built a reputation as a savvy investor, and his shrewdest investment ever is about to pay off huge.
In 2009, the rockstar paid up $90 million and bought himself a 1 percent stake in Facebook. Since then he was content to sit back and let things run their course. In merely three years, his investment has reached gargantuan proportions.
Given that experts have valued Facebook at $100 billion, simple math tells us that Bono's 1 percent stake will make him a billionaire, and thus the richest rock star on the planet. Not even Paul McCartney (of Beatles Fame) comes close to that kind of worth.