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It really is. The stuff facebook serves to me is just so badly wrong it's hilarious that they are taken someone's money to show me an add which if anything is going to result in me even less likely to buy the product

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And yet, you are likely an outlier because many people advertise on Facebook and can specifically track sales per impression or click. They can turn off their ads, and sales stop. They can increase their ad spend and sales increase (to a point).

This is why they keep using online ads. The results can be pretty instantaneous and trackable.

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