So, to refine the target is properly is important.
There was the case in the past that I only added items of interest in the hobby refiners, cost per acquisition has dropped to third. You should remember, that there really is too good set of conditions only attribute.
However, missed too narrow the target could not occur.
If you appear "audience is too narrow" and the audience list that appears to the right of the ad creation screen, you will need to review the refiners as the estimated reach increases.
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