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Unfortunately, no outsider can give you a definitive answer to that question.
Two possibilities that come to mind are:
— Your content was shared on some popular Facebook community
— Facebook’s external crawlers are going crazy on your site
Note that unless you’ve identified specific Facebook.com referrer URLs, “Facebook” here could refer to any Meta property, as the ASN Label for their entire IP space is “Facebook” (likely for historical reasons).
Thanks George, I thought something was suspect when of all these (supposed) viewers, none left a comment.