Social entrepreneurship has evolved a great deal since the late 1980s, when pioneers like City Year‘s Alan Khazei and Teach for America‘s Wendy Kopp took great risks to prove that innovative organizations could produce transformative social change. For the last two years, we have studied this evolution with our partners at Echoing Green, a fellowship-granting organization that provides seed funding to emerging social entrepreneurs. We’ve extensively analyzed the applications to the Echoing Green fellowship between 2006 and 2011, and built a rich dataset that allows us to rigorously study trends in the field of social enterprise.