What do Coach, Jamba Juice, The BART, Juicy Couture, Bravo TV and Harvard have in common? They are a handful of the businesses that have taken the plunge into the social media platform known as Foursquare. There have been some great case studies to support the success of a Foursquare campaign, which we will dive into later but for those of you who are still asking, “What is Fousquare for businesses” let me give you a bit of a background on it.

Those of you who are young, affluent, technically savvy and physically located in one of these cities probably utilize Foursquare.

The location based mobile game eclipsed 1 million users in April, and marketing professionals are taking notice. Many campaigns are integrating the service into their plans, including the Wall Street Journal and Starbucks.