Setting up a date can be hard, even with online services doing a lot of the heavy lifting. You have to find a place you like, a time that works, and of course you need someone to go on the date with.

In the digital dating world, one of the hottest new entrants is the IAC-owned iPhone app Tinder, which has facilitated more than 50 million matches since its launch last October. Tinder’s hook is that ...