Foursquare has made some great updates. By claiming your venue you will be allowed to add specials or coupons that will appear in their own section of the app. For example, popular specials right now are free appetizers at your local restaurant by simply "checking in" once you arrive at the business.
- Visit http://foursquare.com/
- Create an account (always remember to organize your passwords so you can login easily)
- Claim your venue and request the PIN for verification
- Verify your venue - https://foursquare.com/business/verify
- Add me as a friend on Foursquare - https://foursquare.com/free_seo_guide
And a good place to start even if your venue is not yet listed on Foursquare