Social innovation eXchange, otherwise known as SiX, is both an event series (brought to you by The Pittsburgh Foundation in concert with Pop City, The Sprout Fund and sponsored in part by the Buhl Foundation) and a topic we plan to cover more at Pop City. Who's leading the charge in affecting change for the public good? Social innovation requires us to think differently about how to solve tough social problems,: it's getting new people around the table, from techies and artists to those in business and those already working on the issues. It's not just coming up with ideas. It's putting good ideas to work.