Foursquare celebrated its third annual 4SqDay on April 16 (four squared for the math nerd in us all) with the shattering of another milestone: the company has reached 20 million users making a whopping 2 billion check ins.
The company celebrated by throwing parties in New York City, San Francisco, London, Ithaca, and Whitewater, WI.
“In 2010, foursquare fans declared April 16 4sqDay (4/4^2 – nerds after our own heart!). Two years and two billion check-ins later, you’re still why we get out of bed each day. Thanks to all 20 million of you for making us part of your lives,” the company announced on its blog.
The company had previously passed 15 million users in December.
4SqDay was launched by fans in Tampa Bay in 2010.
This year, Portland, Or. Mayor Sam Adams announced April 16 as “Foursquare Day” and Portland State University celebrated with “The Foursquare Day Trail” that had students checking into locations around campus to unlock various deals. One location included Whiffies Fried Pies, a favorite food cart of founder Dennis Crowley in his early days of getting the company off the ground.
The celebration has even spread to Istanbul, Turkey, where the first 50 people to check in to Istikial Avenue in the district of Asmalimescit after 7 pm were given a free shot of vodka.