Magical Targeting Technique for FB ads

Try entering one detailed targeting option in the Interest box instead of adding a bunch of them.
This way, your results would probably determine which targeting option needs to be eliminated.

Do this:

• Hover to the Duplicate option under your ad set and click on it.
• Make (for example) four copies of it. That’ll leave you with five ad sets.
• Open one of the four copies. Scroll down and remove your previous interests and add one targeting option, then change the ad set...

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