Foursquare is the leading site for location-based social media marketing and a great tool for small business.
Launched in 2009 and with 1.5 billion “check-ins,” foursquare boasts 15 million users worldwide as of January 2012
“foursquare builds tools that help you keep up with friends, discover what’s nearby, save money and unlock deals. …“About Foursqure” Foursquare.com
Foursquare allows users to let their friends know where they are and what their doing by “checking-in” to various places on Foursquare. You can check in from bars, restaurants, movie theaters, sports venues, retailers, parks, museums…anywhere.