The meaning of the secret of correspondence is that it can only be seen on the device on which it was created.
Facebook added to Messenger, a function of secret of correspondence, yet it is not available for all devices.
This is stated in reference Facebook.
The meaning of the secret of correspondence is that it can only be seen on the device on which it was created.
Secret communications are secure end-to-end encryption. This means that the message can only be read by you and your partner and no one (even us), – added in Facebook.
The secret correspondence of the labeling with a lock icon, located next to the profile picture of the interlocutor.
