(Marc Nager speaks at the Startup Organizers Summit. Photo by Steven Chau via Flickr.) Scott Heiferman, Meetup.com founder, said it best in a tweet following his closing keynote presentation at the Startup Organizers Summit. “Imagine! Ppl start @startupweekend chapters in cities globally &they come together in KansasCity. #sosummit was impressive.Watch this space!” Heiferman was spot…