While some are just apps, a few also have desktop sites you can log into on your computer -- and there's no shame in using more than one service at a time.
In 2012, Finkel co-authored a lengthy review, published in the journal Psychological Science in the Public Interest, of several dating sites and apps, and outlined several limitations to online dating.
For example, many dating services ask people what they want in a partner and use their answers to find matches.
But research suggests that most of us are wrong about what we want in a partner — the qualities that appeal to us on paper may not be appealing IRL.
Their current conclusion is that the matching algorithms so many companies claim to use to find your soul mate don't work.
The biggest benefit of online dating, Finkel told Business Insider, is that it introduces you to tons (and tons) of people.