Check-in and social-tracking app Foursquare has released an all-new version, now at 5.0, of its iOS app. The new version completely changes the design and places a new emphasis on fast and easy check-ins along with a revamped Explore feature that allows users to see where their friends have visited and what special deals may be available at businesses based on the user's current location. While the app offers mostly the same functionality, many of the features have moved.