Lines:

<?php
if ( ! class_exists( 'Jetpack_Media_Summary' ) ) {
  if ( defined('IS_WPCOM') && IS_WPCOM ) {
    include WP_CONTENT_DIR . '/lib/class.wpcom-media-summary.php';
  } else {
    jetpack_require_lib( 'class.media-summary' );
  }
}

/* function enhanced_og_image() – Better OG Image Tags for Image Post Formats */
add_filter( 'jetpack_open_graph_tags', 'enhanced_og_image' );

/* function enhanced_og_gallery() – Better OG Image Tags for Gallery Post Formats */
add_filter( 'jetpack_open_graph_tags', 'enhanced_og_gallery' );

/* function enhanced_og_video() – Allows VideoPress, YouTube, and Vimeo videos to play inline on Facebook */
add_filter( 'jetpack_open_graph_tags', 'enhanced_og_video' );

/* function enhanced_og_has_featured_image() – */
 

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