> I think the references to FB's "custom audiences" is a red herring - it's a very manual process and very few companies use that feature in any sort of scale.
My experience is that "custom audiences" is a typical/normal usage. Companies that use platforms like Adobe Experience Platform (AEP) create their marketing segments (sets of targeted customers or prospects) in AEP and send those identifiers (e.g. hashed email) to various destinations including Facebook (via "custom audiences").
My experience is that "custom audiences" is a typical/normal usage. Companies that use platforms like Adobe Experience Platform (AEP) create their marketing segments (sets of targeted customers or prospects) in AEP and send those identifiers (e.g. hashed email) to various destinations including Facebook (via "custom audiences").