Look out for names like Coffee Meets Bagel, Match, Tinder, and Zoosk, as they are all popular dating sites. Most social media sites and online dating sites require you to have an email in order to create a profile. You could try searching for someones address using two methods.

How do you find out who someone is dating?

Open up the internet browser. Search for history under the search tab if you dont see it readily accessible. Once you click on history, you should be able to view their recent activities. Look out for popular dating website names or apps such as Tinder, Coffee Meets Bagel, Match, OkCupid, Bumble, and Zoosk.