Foursquare created a year in review of check-ins, from top 3 train stations and wine bars, to the number of Wendys that are mayors of a Wendy's.
The graphic below is a kind of year in review of check-in statistics. There has been a check-in in every country, even North Korea. The most check-ins for a single event happened at the Rally to Restore Sanity and/or Fear, more than 30,000 of them.
Business implications of 3,400 percent yearly user growth aside, what this infographic really shows is that Foursquare is amassing valuable social data that they can sell, like who is going to what movies and when, and useful general information, like that MLK day is a huge movie watching day, up there with July 4 and Christmas—at least for the tech savvy, early adopting Foursquare crowd.