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How Stack Overflow Builds Communities

Not sure how many of you are aware of this phenomenon called Stack Overflow. A question-and-answer site built around programming has been hugely successful in building a strong community. It was so successful that the group behind Stack Overflow, has spawned two more sites based on the model. And wouldn’t you know that each have corresponding meta sites which discuss the details of their counterpart’s operation. (Confused? It gets better!)