This can be an easier way to find people if they're offline or if you're having trouble finding them in the chat box.
If one feels like adding new people to an already existing conversation, one has to tap on the Gear button which is present in the corner on the chat window.
Tap "Allow" or you will not be able to add pictures to Messenger.
There is no "Turn Off Chat" anymore, instead you need to "Turn Off Active Status".
This may be due to the fact, that LiveChat has to be set as the primary receiver in the handover protocol on Facebook.
Once that you have tried to log out and log back in of Facebook, go ahead and try to send a message and see if it will push through.
So with this kind of struggle that some users experience when they are sending messages on Facebook, we have here some quick solutions that you can do on your own for you to have the issue resolved.
The Messenger app by Facebook is separate from the main Facebook app.