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Re:social enterprise start-up by Rhodee on Tuesday September 13, 2011 @04:22PM (#2993351)
I've been steeped in this space for a bit - there's catchafire, 5000hands and a bunch of others.

I guess it all depends on geographic scope and focus of the startup. Unreasonable Institute and Global Social Business Incubator are good places to begin looking.

Hope it helps -