I've been following the idea of "social business" ever since I ran across it through Fred Kofman and Whole Foods. I must say it's an exciting emergence. What I find pleasantly surprising is the time scales thrown around. Whole Foods for example has some pretty ambitious time scales for alleviating world poverty (50 years was it?). Same goes for the United Nations although they aren't a business. What I've noticed about social businesses is they tend to do business with each other. In doing so they are providing the circulation needed to stimulate growth within the community( of businesses that is ).
On a sidenote: Micro-loans, that's very clever. ; )