But I'm not sure why they would do that to begin with.
Two voter-turnout studies are so well-done that the prior has to be that Facebook has significant effects even from one-time intervention.
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but those were effects from actions by *friends*; these were ads. and even then the estimates were tiny fractions of a percentage point IIRC
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it's not binary. Q is size of effects X size of sample that is treated. agree can't know much w/o FB data; point is I have different priors
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