Foursquare allows users to check in anywhere they go and see where their friends are hanging out. Users earn rewards in the form of virtual badges that show up on users' profiles once they've earned a certain number of check-in points or complete a task, such as riding a ferry. Users can become "mayors" by checking in at a location more than any other visitor. The startup has almost 5 million users, and they check in with the site more than 1.5 million times each day.
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