The concept of Facebook Messenger is very interesting.It allows you to do text chats and voice calling for free.There is a lot of features in this app.The design of this app is ok.Till now it is good.But there is a little bug in this app.When you play a vedio it might cause your vedio to freeze.I face connectivity problems.It never run well on slow network.The app asks you a lot of permissions.More than that the Facebook Messenger authority himself convince that they keep an eye on the activity of every user of it.So your private data may be harmed.If you little bit concern about your privacy then stop using it.Otherwise you privacy may be compromised.