The Sun revealed that incoming messages can be read on Facebook without the sender knowing that we have read them by reading the message on the notifications screen, and Facebook Messenger sends notifications to your phone every time you receive a new message.
The contents of the message can be seen in the display, where the notification shows the content of the message, allowing it to be read without opening the Messenger application, so the sender will not know that the user has actually seen it.
However, this hoax becomes less effective once you start receiving a large number of messages, in quick succession.
The notifications screen can contain only a certain number of messages, and old tabs will be revoked when filtering new messages.
When this happens, the user can de-block the application's ability to update and send new data, over the Internet.
By activating Airplane Mode and opening the Messenger app, messages can be read without worrying about the sender knowing it. Make sure to close the app before turning off Airplane Mode.
You can also download the application "Unseen", if the user wants to use a computer browser, which is one of the similar applications available for users of "Google Chrome