Delete All Facebook Messages
To do this, you need to first direct to your inbox, try to find messages you want to delete, then press on 'Settings', click 'Report Spam or Abuse' as the photo
A little window will pop up, pick the 2nd option and press 'OK'.
Facebook will lets you to select messages you wish to delete. After examining messages, you will on' Mark as Spam' to erase examined message right away.
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