Swarm is a mobile app for iOS, Android and Windows Phone 8.1 that allows users to share their locations within their social network. A spin-off of the older Foursquare application, Swarm allows users to check-in to a given location, as well as make future plans with friends and see who is nearby.Swarm is a companion App to Foursquare 8. Location and check-in data collected in Swarm are used to improve a user's recommendations in Foursquare.