Shopkick

Shopkick Homepage

Mobile app for Android and iPhone

Special equipment at participating retailers broadcasts a special audio signal that the app can hear (when launched). This "checks you in" to the store and you are rewarded with "kicks" which are in-app points. You can cash in in-app points for gift certtificates and other sorts of prizes.

Platform also distributes instant coupons/promotions. Their whole bit, in short, is using the app to motivate you to physically visit a store.