Location based marketing utilizes a business's location to interact with and target customers. It can involve sending targeted messages to customers based on their location, offering deals to those in a certain area, or allowing customers to check-in and share their location on social media. Some common location based marketing tools discussed in the document include Facebook Places, Foursquare, Google+ Local, Twitter, Living Social, Groupon, and Yelp. These tools allow businesses to promote themselves to customers within a certain radius, learn more about customers' locations and interests, and offer deals or rewards based on check-ins.