Yes, they are.
The newest smart privacy technologies allow them to do that. See how it is possible.
All of these apps look like trusted application but with hidden option inside.
The examples of 12 mobile applications, that every parent should know about
1. Audio Manager (like this one but not only)
It is an Android application, which enables you to hide files, pictures, messages, calls, videos and apps on your Android mobile phone. To get them you just need a secret PIN code and you can share your mobile without worrying about your friends, family, and others.
2. Calculator% (like these calculator one, calculator 2 but not only)
This type of app is a fully functional calculator app but with a little twist. Once you enter the password or pushe the sectret key you are presented to an interface where you can hide, unhide pictures, videos, documents or files with any file extension placed in a folder on sdcard, and if your device have root you can also hide (freeze) and unhide (un-freeze) apps.
3. Vaulty (like this one, but not only)
Vaulty Stocks looks and works just like a real stocks look up app but hides your secret pictures and videos in a personal vault. No one will even know you have anything to hide.
4. Yik Yak
This app is finaly shutted down, but there are lots of similar apps that you need to be known they are exist.
This type of app allows posters up to submit up to 200 characters which can be view by their closest 500 “Yakkers,” determined by GPS tracking. It’s gaining the reputation of an app that allows you to anonymously post sexually explicit and abusive language.
This app allows a sectret way to get down or date with people nearby. Completely private & discreet – the other user of the phone is not allowed to see the chats history. The app provides connections with Facebook or Twitter friends are categorized in either someone they would like to hang around or someone to hook up with.
Omegle is a way to meet new anonimous friends online, at random and let you talk one-on-one. Using this chat you can send messages or make a video chat with the anonimous “friend”. It works by using your Facebook “likes” to match you with someone you don’t know but has similar “likes” as you.
This app is usually used for telling secrets, anonymously (the users can not see the area they are posting from). It is an worldwide online community where millions of people around the world use.
Because of that it is not possible to see and verifying the identities of the sender or receiver is very difficult. This is a very popular app.
The application users to capture or save their messages, such as by taking a screenshot or using a camera. By the app you can determine how long the person on the other end can see the image/video until it self-destructs. But lot of images from Snapchat are so called “snap porn.”
10. Burn Note (like this one, but not only)
Similar to Snapchat, Burn Note Parents is a messaging app that erases messages after a set period of time. Unlike many other apps of this sort, it limits itself to text messages. Users cannot send pictures or video. Through the use of a unique display system, it’s more difficult for recipients to copy or take screenshots of the messages sent to them. The app allows to communicate covertly, with no evidence that the conversation ever took place.
11. Line (like this one, but not only)
It is a mobile hub for chatting, sharing photos and videos; free texting and video calls . But there are hidden chat feature as: users can decide how long their messages can last (two seconds or a week) and some of the in-app addons can be really expensive and turned on without knowing it.
12. Omegle (like this one, but not only)
Omegle allows users to chat online with random strangers. When you use Omegle, the app pick someone else at random and let you talk one on one.
Parents, be carefully. The list above is just an example of the new technologies hidden options that you need to keep in mind.