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Today, ""social entrepreneurship"" describes a host of new initiatives, and often refers to approaches that are breaking from traditional philanthropic and charitable organizational behavior. Nowhere is this more true than in the United States-where, from 1995-2005, the number of non-profit organizations registered with the IRS grew by 53%. But, what types of change have these social entrepreneurial efforts brought to the world of civil society and philanthropy? What works in today's environment? And, what barriers are these new efforts breaking down as they endeavor to make the world a b