Evoke is a new social networking game developed for the World Bank by by renowned game designer Jane McGonigal. The goal of Evoke is simple, change the world. That's right, the free game is open to people all ove rthe world and the challenge is to solve the worlds pressing social and environmental challenges. If you want to read more on Jane's thoughts on how gaming can change the world, make sure to check out her new book Reality is Broken: How Games Will Save the World.