Facebook Quietly Offering Downstream Conversion Tracking To Its Favorite Advertisers

Facebook installs its own pixel on an advertiser’s conversion page, such as an ecommerce checkout or signup success page. Facebook references who triggers this pixel with its own logs of who has seen what ads.

Nothing here that could not be done before but there is one major shift: Facebook is now the primary owner of the user data, making your shoppings a new asset in the array Facebook already has.