The terms social entrepreneur and social entrepreneurship were used first in the literature on social change in the 1960s and 1970s.[15] The terms came into widespread use in the 1980s and 1990s, promoted by Bill Drayton the founder of Ashoka: Innovators for the Public,[16] and others such as Charles Leadbeater.[17]
http://en.wikipedia.org/wiki/Social_entrepreneurship
Bill Drayton http://en.wikipedia.org/wiki/Bill_Drayton