code: function initFacebookAdvancedMatching() {
  	const normalizedHashedEmail = getNormalizedHashedUserEmail( user );
  	const advancedMatching = normalizedHashedEmail ? { em: normalizedHashedEmail } : {};
  
  	debug( 'initFacebookAdvancedMatching:', advancedMatching );
  	window.fbq( 'init', TRACKING_IDS.facebookInit, advancedMatching );
  
  	/*
  	 * Also initialize the FB pixel for Jetpack.
  	 * However, disable auto-config for this secondary pixel ID.
  	 * See: <https://developers.facebook.com/docs/facebook-pixel/api-reference#automatic-configuration>
  	 */
  	window.fbq( 'set', 'autoConfig', false, TRACKING_IDS.facebookJetpackInit );
  	window.fbq( 'init', TRACKING_IDS.facebookJetpackInit, advancedMatching );
  }
docs: See https://developers.facebook.com/docs/facebook-pixel/pixel-with-ads/conversion-tracking#advanced_match