How Long Can You Keep Old Apps on Your Phone After They Shut Down?
Last month, when the once-popular app Foursquare finally shuttered, I knew I’d never delete it. I’d been using it on and off for well over a decade, first to share location check-ins with friends, and later as a Yelp-like city explorer. My usage had waned in recent years, but Foursquare had been a part of…