Swarm is a location-based social network which has been spun-off from the main Foursquare app. It includes friend finder, nearby friends, leaderboards, badges and mayorships.
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Pro Powered by Foursquare
All of the places data is obtained from Foursquare, as Swarm is part of Foursquare product.
Leaderboard is a features that ranks how frequent you and your friends gain points via check-ins, exploring new places and mayorships.
Mayorships is a feature where the person with the most check-ins in that particular place will be rewarded with a mayorship of that particular place.
Formerly known as badges in the original app, you will be rewarded stickers whenever you check-in to a specific place or for the number of check-ins you have made.
Con Viewing a place requires main Foursquare app
Since there is a split between place discovery and the social check-in feature in main Foursquare app, anyone who wants to check out a place must install the main Foursquare app in order to view the places details, photos and contacts.