Fb Messages Can't Deleted, only Archived.
After you receive a message, it is marked as Read. After reading it, you go back to the inbox with all you previous messages. When you click the 'x' button on the right side of the message, you are not deleting the message, you are actually just saved it to archived.
To view your archived messages, do the following.
1. Go to you FB Message inbox.
2. Scroll Down.
3. Click Archive button (as shown bellow)
