Between the Bieber and Gaga-fueled spread of the Kony 2012 campaign and George Clooney's arrest in Washington, celebrity activism seems to be the trending topic of the moment. Activists tend to grumble at celebrity do-gooders, but cable networks and politicians tend to focus on the world's undercovered hotspots more easily when there's a famous face to go along with a worthy cause. Here's a look at 10 stars who, for better or worse, are shaping the debate on global poverty and conflict.
Activities: In 2010, the actor helped found the Satellite Sentinel project to monitor human rights abuses in South Sudan. More recently, he traveled to Sudan to document violence in the Nuba mountains, where the Sudanese government is accused of blocking humanitarian assistance as part of an effort to crack down on separatists. Upon his return, he testified before the U.S. Congress, debriefed President Barack Obama and Secretary of State Hillary Clinton on his trip, and sat next to First Lady Michelle Obama at David Cameron's State Dinner. On March 16, he was arrested along with his father at a protest outside the Sudanese embassy in Washington.