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Arrivals for Foursquare is an app based on a concept developed by Toby Barnes for his eight-year-old son to keep track of him while on business trips. Originally called “Where’s Dad?”, the web-based program was made to display Barnes’ current locations based on check-ins. The updates were shown directly on the screen of a spare iPhone he gave his son and were designed to look like an arrivals board from an airport. - link
