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A week of Foursquare check-ins

A week of Foursquare check-ins

Last week Foursquare celebrated a pretty major milestone, logging its billionth check-in. While the service isn't huge here, it has 10 million users worldwide (including, by the looks of it, some extremely active ones in Tokyo). Here's what a week's worth of Foursquare check-ins across the globe looks like.