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A comment on What do we really know about the effectiveness of digital advertising?. Parent comment

Re:What do we really know about the effectiveness of digital... by nabla9 on Wednesday November 06, 2019 @03:25PM (#21466785)
How do you know it's not selection effect and the ROAS number are BS just like they are with Google? Have you tested?

Google and Facebook are 60% of the market, so if it would be only them this is important.

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