We're all used to the notion of online and mobile dating by now; OKcupid, Match.com, eHarmony, the list continues to grow. To some extent, it makes sense -- modern life is becoming more and more hectic with most people working longer hours, and many no longer have the time to have relationships grow organically. But Tinder, a new dating app for your phone, has refined the art down to a basic "hot or not" principle.