Here I try to make the case that my generation is actually good at building community. Mainly I take aim at Robert Putnam’s book Bowling Alone, where he argues that this generation of young adults has not done its part in creating “social capital.” It’s true that we’ve not joined the community groups our grandparents belonged to but we’ve done something more interesting and harder to document. We’ve created community among networks of friends. This has led to what I call “social dark matter.” The community building that goes on among these networks of friends is difficult to document but it creates a force that binds together whole cities. I cited Critical Mass as an example of how this social dark matter can suddenly become visible. Since the book came out there have been more examples, like flash mobs, Friendster and Tribe.net We seem to be coming to understand how these loose networks of friends can have an impact in the world.