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Beginning today, follow the Olympics on foursquare and check-in to any of the “London Live” sites (yes and sorry, you have to be in London to unlock the badge) and you will receive the following message:
You’ve just checked in at one of the many Olympic live sites! Enjoy watching the Games on the big screen, and for your chance to win tickets to the London 2012 Olympics, enter the sweepstakes at http://hub.olympic.org/olympicday2012
Users that unlock the badge will be eligible to win free tickets to the Olympic games. The International Olympic Committee is giving away two tickets each day.
Good luck and Go Team USA!