Foursquare is splitting their app into two parts. One for check-ins and the other for finding what your friends are up to.
The concept is that check-in experience will become passive. Foursquare will be about search, discovery, and more on the interaction with the apps ( and your friends ) as opposed to get in and get out app experience that they have had thus far.
The app is currently being built but you can sign up to be notified when it is ready.
Foursquare itself will be fine tuned to allow you to discover new locations to try out. Instead of merely just check-in and leave. Looks like they are trying to build out the engagement with the app as well.
Swarm is for people who want the fastest and easiest way to connect with their friends. Foursquare is for explorers who want to know about the best spots, and to share what they’ve found with others.