It is a Q&A site where users can ask other users questions anonymously. In 2014, its new owners pledged to crack down on bullying or said they would shut down the site.

The problem is that kids sometimes target one person and the questions get nasty.

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Again, by promising a complete delete, kids could feel more comfortable revealing more than what they would do otherwise.

And again, capturing a screenshot so that the message can be shared and lives forever, may be the app's Achilles' heel.

is an anonymous chat client with which users discuss anything they'd like.

This can easily result in conversations that are filled with explicit sexual content, lewd language, and references to drugs, alcohol, and violence.

Vaulty will not only store photos and videos away from parental spying eyes, but it also will snap a photo of anyone who tries to access the "vault" with the wrong password.

Parents who find it on their teens' phones can conclude just one thing: Your kid is hiding things from you.

The best control you have (besides taking the phone away) is to just have a frank heart-to-heart about how there is no such thing as texts or photos that disappear and this is some down-and-dirty stuff that can come back to haunt them.

Like Snapchat, Burn Note is a messaging app that erases messages after a set period of time.

Not everything online is evil, nor does danger lurk behind every new app that comes to market. Kids can hide any app they don’t want you to see, Teen Safe says.

But keeping up with your teens' and preteens' online activities is much like trying to nail jelly to the barn door -- frustrating, futile and something bound to make you feel inept. Such is the case with Audio Manager, an app that has nothing to do with managing your teen's music files or controlling the volume on his smartphone and everything to do with him hiding things like nude photos from you. When you press and hold the Audio Manager app, a lock screen is revealed -- behind which users can hide messages, photos, videos, and other apps.

Many users ask for personal data upfront, including location, age, and gender [ASL], something kids might supply (not realizing they don't have to).