I did use Foursquare once. The blood bank made me check in on Foursquare to get ... | Hacker News

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auctiontheory on April 12, 2013 | parent | context | favorite | on: Foursquare raises $41 million Series D round

I did use Foursquare once. The blood bank made me check in on Foursquare to get a t-shirt. (Nice shirt, with a captcha-based pun - I still wear it.)

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