The power of Silicon Valley is evident in almost everything we do. But is the drastic change that technology has wrought on modern life having an effect on the world of social entrepreneurship? And is an ethos of responsible business that is becoming so evident in society reaching into the businesses of the Valley? To get at the issue, Fast Company has teamed with the Skoll World Forum to ask some of the world's leading voices in the valley and in the field to answer this question: "What can Silicon Valley teach social entrepreneurs (and vice versa)?”