Whether you sent a message to the wrong person or used the wrong form of “You’re”, you just need to make that delete Facebook messages message go away.
1. Tap and hold the message you want to delete.
2. Click “Remove.”
3. Select “Remove for Everyone.”
4. Confirm removal of the message.
5. A tombstone will appear in the message thread, stating “You removed a message.” www.monktech.net/blog/how-to-delete-facebook-messages/