Setting out to make social change is good to hear but it is tough to actually get done. I haven't made any or for that matter actually have started doing anything big towards that but I have had opportunities to be part of or to contribute to multiple ventures/initiatives over the course of the last 4 years. Through these learning experiences I have come to realize the importance of two factors for making sustainable social change - persistence and scalability. A case in point is the TidyCity campaign which started in 2009 and which has been gaining ground and momentum over the past year or so.