"“Wellman is finding that Twitter isn’t flat,” Vidantam says—as if Tom Friedman’s chimerical “flatness” (the analytic value of which has proven to be nil) is the only possible quality of transformative political agency.

In last year’s revolutions, it wasn’t flatness that gave social media its power. It was its hyperlocality, its novel blending of intimate communities and witness at a distance.

Other work in which Wellman is involved argues for the richness of real-world community life that gets instantiated in Twitter. In a paper called “Imagining Twitter as an Imagined Community,” Wellman & his coauthors find that Twitter networks are “the basis for a real community, even though Twitter was not designed to support the development of online communities. There they conclude that “studying Twitter is useful for understanding how people use new communication technologies to form new social connections and maintain existing ones.”

Here’s the thing: Twitter is part of the “real world.”"