there’s no question that social networks display geographic sorting to varying degrees — whether it be a group of young professionals all clustering in the same hip neighborhood, or a whole professional caste which tends to be bi-coastal. And these geographic factors tend to line up with many other kinds of consumer preference: just imagining the stereotypical Brooklyn hipster from Williamsburg invokes a whole array of choices spanning media, clothing, food, technology, and so on (and just because it’s “stereotypical” doesn’t mean it’s not true — quite the opposite, in fact).

via MediaPost Publications Like ‘Em, Sure, But Would You Listen to Their Advice? 12/07/2010.