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Why it's popular: Although there are some friendly interactions on -- Q&As about favorite foods or crushes, for example -- there are lots of mean comments and some creepy sexual posts.

Here's what you need to know about the anonymous and disappearing-message apps you're likely to find on your kid's phone: Anonymous Apps and Sites On the positive side, going incognito online helps us express ourselves in ways we might not be able to in the real world.

On the negative side, anonymous apps are often riddled with inappropriate content. Ask.fm: A social site that lets kids ask questions and answer those posted by other users -- sometimes anonymously.

Depending on what they want to say and to whom, teens choose the app that best fits their needs.

If they don't want a message to hang around, they'll use a temporary app such as This so-called "narrowcasting" (as opposed to broadcasting) is probably a positive trend and prevents some oversharing.

Users don't have to reveal real names, so there's a layer of anonymity.

Why it's popular: You can send unlimited messages without depleting your texting limit; you can see whether someone has read your message; you can send individual or group messages; you can surf the Web from inside the app itself; and you can access tons of other content from within the app.

But it doesn't mean teens can't still get themselves in trouble.

Though most teens are only sharing day-to-day moments with an already-tight social group, there can be unintended consequences when teens think temporary messages really disappear forever or when they make mean comments under cover of anonymous apps.

Teens may pay more attention to Snapchats that they receive, knowing they'll disappear in a matter of seconds.

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