A new app aimed at gay users is about to break open an entirely new feature that will redefine the cyber dating business. And a young man emerging from a shower gets his inspiration for a new hookup site as he wipes the steam from his mirror. Soon Tinder is on fire, but the conglomerate Match Group is determined to get a stranglehold on the market. And as the industry leaps from computer screens to mobile devices, things are heading into uncharted territory.