What it is
It is an app to message your friends and relatives. You can also make audio and videos calls. It is kind like WhatsApp.
Pros
Help you keep in touch with your friends and your relatives
It is quick and easy.
You can make your own account.
Cons
If someone gets into your account, they can get your information.
They can get your phone number.
Anybody that has your Facebook profile can message you.
How to be safe
Put your account in private.
Don’t send personal information.
Don’t send pictures via the app.
Don’t message unknown people.