How to Send Self-Destructing Messages in Facebook Messenger
Step 1. Open the Messenger app (Must be updated to the latest version).
Step 2. tap the compose new message button at the top right.
Step 3. On the ‘New Message’ screen, tap ‘Secret’ at the top right
Step 4. Select a contact to send the secret message to.
If your contact doesn’t have the latest version of Messenger, they will not be able to read your message.
Step 5. Once you’ve selected the friend you want to send the message to, enter you message.
By default, the messages are not set to self-destruct.
Step 6. To send a self-destructing message, tap the little timer button just above the thumbs up emoji.
Step 7. Select how long the message will remain visible, and then send it.
When you have self-destruct enabled, all messages in the thread are set to self-destruct in that same time period. When it expires, neither you nor your friend can ever see those messages again. You can turn it Off any time but that will not retrieve the messages that have already expired. Each self-destructing message has timer that counts down time left until it self-destructs.