Once upon a time, "checking in" was the hip thing to do back when social networks were really young. Foursquare was practically the only service that let you tell the world, or hopefully just your friends, where you're at and how great the pasta is there. Eventually, the likes of Facebook and Twitter gained similar functionality, forcing to Foursquare to redefine its purpose. It spun off Swarm to focus on that use case. Now at version 4.0, the service has tacked on some features that turns Swarm into a sort of lifelogging partner as well.