Facebook Delete All Messages
To do this, you must initially direct to your inbox, try to find messages you desire to delete, then press on 'Settings', click 'Report Spam or Abuse' as the image
A small window will pop up, pick the second option and press 'OK'.
Facebook will lets you to choose messages you wish to erase. After examining messages, you will on' Mark as Spam' to delete examined message immediately.
If that's all we can tell about Facebook Delete All Messages I hope this article was helpful thank you.