Every smartphone user between the ages of 18 and 50, who is attracted to other people in either theory or practice, knows about the Tinder dating app. On the off chance you’ve carved out a paper-thin cultural niche for yourself and have successfully dodged any passing reference to the phenomenon — or you’re in a healthy long-term relationship — then I’m not talking to you. The rest of you seeking emotional fulfillment with the help of a digital device, prepare to have your mind blown: Afghanistan has Tinder.