Facebook Settings

General
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Enable Meta Pixel (formerly Facebook Pixel)

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Enable Advanced Matching

Because of a Facebook error, when Advanced Matching is ON, Custom Audiences based on the pixel will not show the size number ("Size: -1", or "Size Unavailable"). They will still work fine for retargeting or Lookalike Audiences. Details here.
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Remove Facebook default events

Fire more events and parameters and improve your ads performance.
Find more about the PRO Meta Pixel (formerly Facebook Pixel) implementation