Location based services, of which Foursquare is the most popular, are quickly being ubiquitous as smart phones and internet penetration become more prevalent. Foursquare allows users to check-in to locations which they can then share with others on Facebook and Twitter.
Foursquare allows owners of retail venues to create specials that customers can claim and in doing so drive foot traffic through their doors. As an added bonus, managers can also get detailed analytics about checkin activity.
Many local companies have already started implementing Foursquare specials and iClinic can help you setup yours.