Trying to delete Facebook files from my Mac

  Henry V 13:51 12 May 2018
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I am not a Facebook member, having closed my account some time ago. Looking at my Mac today I notice 204 Facebook files/Documents. I tried to delete them but could not as they were 'needed' by my Mac??? "204 items can’t be moved to the Trash because they can’t be deleted." What can I do?

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