From Live Aid to Make Poverty History, celebrities have become activists against poverty. Bob Geldof and Bono have been the most prominent voices advocating on behalf of the poor.
Geldof, Bono and Bill Gates speak candidly about how to lobby effectively and how to play to politicians' weaknesses for glitz and popularity.
They have been criticized for over simplifying issues and failing to challenge the fundamental causes of poverty. But they've also received praise for saving lives and bringing an awareness of poverty to a new audience and a new generation...
Can poverty be tackled without celebrities? Do they put issues in the spotlight or cause more harm than good? Have their concerts and campaigns really lifted millions out of poverty?