Facebook CEO Mark Zuckerberg owes more than $1 billion in taxes
Facebook CEO Mark Zuckerberg might be un-friending Uncle Sam.
Zuckerberg is expected to owe the IRS more than $1 billion in taxes for 2012.
That's because he opted to buy more than 60 million shares when the site went public last year.
The IRS will treat those stock options as roughly $2 billion of income.