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The app (and the companion desktop version) identifies the location of a user by tracking his or her device’s location and then matches pictures and profiles of potentially thousands of people the user could contact in the surrounding area.

Unless you’re single, you might not be familiar with dating apps such as Tinder, where users can quickly swipe through prospective dates. But it’s likely your teenage knows all about these apps — even tho’ they’re mostly designed for adults. According to the company’s own estimates, about 7 percent of Tinder’s users are age 13…