InformationWeek reports that check-in app Foursquare is splitting into two pieces. One of them -- the part that will retain the Foursquare name -- is actually losing the original check-in functionality, in favor of local reviews and recommendations; a second app called Swarm will get the who's-where-right-now part of the Foursquare functionality. From the article: "Foursquare isn't the first company to unbundle its features into new apps. Last month, Facebook announced that it will separate in-app messaging from its official iOS and Android apps and require users to download Messenger to chat with friends. Users will have two weeks to download Messenger before the service in the main Facebook app disappears, the company said. ... Foursquare's changes also aim to capitalize on a mobile app trend: Taking online friendships offline to meet up in person. Most recently, Facebook announced its opt-in Nearby Friends feature, which will display your friends' locations on a map and track, store, and share your location with others."