How To Delete All Messages On Facebook
To do this, you must first direct to your inbox, search for messages you wish to delete, then press on 'Settings', click 'Report Spam or Abuse' as the image
A small window will appear, pick the 2nd option and press 'OK'.
Facebook will lets you to pick messages you wish to erase. After checking messages, you will on' Mark as Spam' to delete inspected message instantly.
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