Source: Melanie Eversley / USA Today A social media campaign to stop an execution in Georgia next week is drawing support from hundreds of thousands of people around the world. Celebrities, Nobel laureates and national leaders have joined the NAACP, Amnesty International and the grass-roots group Change.org to urge Georgia authorities to grant clemency to Troy Davis, who is scheduled to die by lethal injection Wednesday. They are flooding Twitter with several tweets a minute, signing online petitions and, starting [...]