Clear the cache of the Facebook Open Graph

clear_cache_facebook.php

<?php

  function clear_cache_facebook($post_id) {
  	$url = get_permalink($post_id);
  	$fb_graph_url = "https://graph.facebook.com/?id=". urlencode($url) ."&scrape=true";
  	$result = wp_remote_post($fb_graph_url);
  }
  
  add_filter('publish_post', 'clear_cache_facebook');