If you’re a retailer, and they check into multiple locations in multiple cities, give them 10 percent off their purchases for an entire month. Alan Danzis is a Senior Social Media Specialist at Ketchum PR. For almost a year now, I’ve done all I can to extoll the virtues of  Foursquare to friends and colleagues in the PR world. I even  blogged for a friend once about how I use it to help in my exercise-routine and my desire to become more healthy. While the user base is still somewhat small ( around six million ), members are passionate and the media still care what they’re doing.