Mark Zuckerberg is the world's youngest billionaire

Number 785 on the Forbes Billionaires list is one Mark Zuckerberg. Forbes estimates his net worth at $1.5 billion — a far cry from the $5 billion we pegged him at last year — but still a nice chunk of change. (We've since learned the actual number is $4 billion; he owns 27 percent of Facebook.)

The mag notes that "some analysts — and even a few Facebook investors — suggest the company's value is far lower." Even with that proviso, Zuck still ranks as the youngest billionaire in the world and "possibly the youngest self-made billionaire ever." Damn. I can't wait for the call from my mother — "Mark Zuckerberg is worth a billion dollars. What are you doing with your life?" Thanks a lot, Mark. You're making us all look bad.