The document provides information about various location-based social media services and applications. It discusses apps like Foursquare, Twitter, Facebook, Google+, and Groupon. For a class activity, students are divided into teams and instructed to check-in at assigned locations using Foursquare and tweet pictures with hashtags for a chance to win prizes. The document then gives overviews of each app, how they work, their features, and why consumers and businesses like using them. It also compares Foursquare and Groupon.