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"pay by the number of impressions served"
Huh? You can bid for clicks or even conversions.

You might also consider whether allowing unlimited randomization of creative by advertisers creates incentive problems.


Hi Dean, I think that must have been a business decision. For leads ads, advertisers are not allowed to pay by leads - the only choice was by impressions.


Not familiar with that feature, but I can see how various incentive problems may arise.

You might try other outcomes.

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