When I moved to New York City, two iPhone apps were essential: Google Maps and Grindr. My first Grindr date was Z. He was handsome in his profile picture: a little skinny, dark-haired, complete with the facial hair and flannel shirt of your typical Brooklyn hipster. He lived a few stops on the L train and asked me to a drink at a nearby bar. I met him off the train stop, as he lived...