After making a paltry $2.3 billion in 2012, newly filed regulatory documents for Facebook founder Mark Zuckerberg show him making a whopping $3.3 billion in 2013 after exercising stock options. Even after all that cashing in (on top of a donation of $1 billion in stock to a charity), Zuckerberg, 29, still has 426.3 million Facebook shares, which are valued at roughly $25 billion.
