The simple joy of a social network most people forgot about years ago

Hello again and welcome back to Fast Company’s Plugged In. If you owned a smartphone a decade and an half ago and were into cool new apps, there’s a more-than-decent chance you tried one called Foursquare. The best known of a then-new breed of location-based social networks, it let you check into places you visited in the physical world, and see where your friends were checking in. One Foursquare fan quoted in an October 2009 New York Times article by Jenna Wortham called the ability to fi...