Facebook Pixel specifically for Shopify.
https://help.shopify.com/en/manual/promoting-marketing/analyze-marketing/facebook-pixel
Analytics and Tracking
Get access to data on 1,547,777 websites that are Facebook Pixel for Shopify Customers. We know of 729,634 live websites using Facebook Pixel for Shopify and an additional 818,143 sites that used Facebook Pixel for Shopify historically and 443,572 websites in the United States.
Facebook Pixel for Shopify websites that are also using other technologies.
Get a list of 1,547,777 websites using Facebook Pixel for Shopify which includes location information, hosting data, contact details, 729,634 currently live websites and an additional 406,851 domains that redirect to sites in this list. 818,143 sites that used this technology previously and 443,572 websites in the United States currently using Facebook Pixel for Shopify.
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