I focus on Facebook because it's consequential but also because it's a familiar example for computational decision-making. Issue is wider.
It is new. We knew of some personalization, but did not know if it was chunked and how. See my TL for another confirmation.
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chunked? from the very start we knew everyone got different trends, and that was algorithmic
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It could have been "everyone in this city sees same" etc. Much different than if it is p(clickthrough) at individual level.
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