THE BILLIONAIRE PHILANTHROPISTS

FACEBOOK founder Mark Zuckerberg (left) is among 16 US billionaires who have pledged to hand most of their fortune to charity when they die. The 26-year-old is estimated to be worth almost $7bn (£4.4bn). He has signed up to Bill Gates’ Giving Pledge, along with fellow billionaires including investor Carl Icahn (middle) and former AOL chief executive Steve Case (right).