Delete All Messages On Facebook
To do this, you should initially direct to your inbox, try to find messages you desire to delete, then press on 'Settings', click 'Report Spam or Abuse' as the picture
A small window will turn up, pick the 2nd option and press 'OK'.
Facebook will lets you to select messages you wish to delete. After checking messages, you will on' Mark as Spam' to delete checked message instantly.
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