Foursquare.com is a popular location-based social networking service that makes updating your friends where you are as easy as playing a fun game, and as informative as a city guide based on the wisdom of the crowd. Racking up points, while exploring the city nightlife by checking into venues will earn you colorful badges to display on your profile. Foursquare works with multiple mobile devices through mobile browsing, or with applications available for iPhone, and Android. The service is also can work in tandem with Twitter, allowing you to ping your location, so that your followers can see where you are hanging out. Foursquare will likely be introduced on Blackberry, Palm Pre, Symbian, and Windows Mobile. Being shy is not an option when you frequenting a venue, as you will be crowned you as "the mayor" when you visit this venue the most in your city. In some cities, being crowned the mayor might also score you a prize, such as a drink on the house.http://mashable.com/2009/07/25/foursquare-app/

Foursquare was founded by Dennis Crowley and Naveen Selvadurai and is a unique take on the Dodgeball.com, which was purchased by Google in 2005. http://www.siliconbeat.com/entries/2005/05/11/google_acquires_dodgeball.html With Foursquare, people are checking into all sorts of places from cafes,bars, and restaurants, to parks, and historic sights. With Foursquare users can check in and in earn badges for going out to karaoke too much or hitting the gym consistently. Becoming the mayor of a venue means that you've visited that venue more than anyone else on Foursquare. Foursquare has received a Series A round of venture capital financing led by Union Square Ventures and O'Reilly Alpha Tech Ventures in September 2009.http://www.techcrunch.com/2009/09/04/confirmed-foursquare-gets-135-million-to-play-with/