A geographic analysis of Twitter's spread is remarkable for the service's independence from the regions that are conventionally thought of as tech hubs, writes Pete Warden. Early adopters on both coasts, but also in the middle of the U.S., helped spur the network's rapid growth, he notes; geography essentially didn't matter. "That has some interesting implications for anyone starting their own service, it looks like focusing on virtual communities instead of physical ones can be very effective," he writes.

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