An interactive promotion for the new H&M collection. Posted by hyperspacemedia on March 9, 2011 Posted in: March 2011. Leave a comment H&M poster sites in New York acted as Foursquare check-in locations. Whoever became the mayor (the person with the most check-ins) of one, or several, of these sites after 72 hours won the clothes in the ads. Share this:EmailFacebookTwitterMorePinterestLike this:Like Loading... Related Posts navigation ← Mobile phone controlled game McDonald’s exclusive content for people checking in on facebook places →