And there are very real dangers for children, such as a recent and very disturbing Whats App suicide challenge. But apps that communicate with other people can make it harder to tell where the dangers lie.
Some make an effort to filter or moderate communications between users; others don't.
If you have a teen, chances are, they've got a smartphone.
Check the location settings on each app to see if your child's whereabouts are being broadcast, or just turn off location services altogether.
(Here's how to do it on Android devices and i Phones). Often, they're designed to be small so that they don't seem like a big deal, but they can add up quickly.
In addition, check the photo settings on the phone to make sure it's not attaching a location to images shot by the phone's camera. Nicknamed "Tinder for teens," Yubo is a chat and livestreaming app where teens can make new friends based on their location.
(Yubo encourages users to let the app use location services, though it's not required.) Minors are supposed to be relegated to their own part of the app with no adults allowed in, but I had no problem signing up as a 14-year-old girl with a picture of President Trump as my profile pic.
You have to spend money if you want more chat time or only want to chat with people of a certain sex.