Domain Verification provides a way for you to claim ownership of your domain in Facebook Business Manager.
https://developers.facebook.com/docs/sharing/domain-verification/
Frameworks
Get access to data on 2,280,243 websites that are Facebook Domain Verification Customers. We know of 1,329,595 live websites using Facebook Domain Verification and an additional 950,648 sites that used Facebook Domain Verification historically and 559,119 websites in the United States.
Get a list of 2,280,243 websites using Facebook Domain Verification which includes location information, hosting data, contact details, 1,329,595 currently live websites and an additional 2,714,446 domains that redirect to sites in this list. 950,648 sites that used this technology previouslyand 559,119 websites in the United States currently using Facebook Domain Verification.
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