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a point for improvement: facebook's auction system is quite aggressive in picking its favorites. Having that many ads in one campaign, especially one with such a low daily budget, will cause one to get nearly all the impressions and take over.

You also can't stop ads after only a thousand or so impressions. Let them run for 50k+ before cutting, as an ad that performs well will take a decent amount of clicks for the bid to fully come down.

Facebook's own guide on A/B testing your ads suggests creating a separate campaign for every single variation, in order to avoid this issue. I've still found that just 1-2 clicks causes one variation's impressions to go through the roof.


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