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A comment on Google and Facebook ad traffic is 90% useless. Parent comment

Re:Google and Facebook ad traffic is 90% useless by FabHK on Monday January 16, 2017 @05:54AM (#13409314)
Goodhart's law: "When a measure becomes a target, it ceases to be a good measure."

https://en.wikipedia.org/wiki/Goodhart%27s_law

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