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Re:Chris Hughes Says It’s Time to Break Up Facebook by tremon on Thursday May 09, 2019 @11:17AM (#19869028)
and effectiveness can be measured

I don't think this is a prerequisite at all. Isn't most marketing focused on the persuasiveness of the seller, instead of the effectiveness of the product?

Re:Chris Hughes Says It’s Time to Break Up Facebook by manigandham on Thursday May 09, 2019 @09:00PM (#19874117)
Regardless of what metric is used, ad platforms get more money by proving they're better at said metric, so measurement is required.