Signs of the times
The intrigue comes much lower on the list, where Zuckerberg, who didn't even qualify as a billionaire last year, ranked higher than Jobs, who founded Apple some eight years before Zuckerberg was even born. No. 35 Zuckerberg ($6.9 billion) got a boost last year from a $200 million infusion of cash in his social-networking titan. Despite Apple recently passing Microsoft in valuation, the majority of No. 42 Jobs' ($6.1 billion) net worth comes from his shares in Disney, which bought his Pixar animation studio in 2006 for $7.4 billion.
Following in tech's tradition of philanthropy, Zuckerberg is expected to announce a $100 million donation to the Newark, N.J., school district during an appearance on the Oprah Winfrey show Friday.