Adds Facebook SDK anchor and Namespaces to Wordpress

functions.php

<?php

function facebook_namespaces($attr) {
  $attr .= "\n xmlns=\"http://www.w3.org/1999/xhtml\"";
  $attr .= "\n xmlns:og=\"http://opengraphprotocol.org/schema/\"";
  $attr .= "\n xmlns:fb=\"http://www.facebook.com/2008/fbml\"";
  return $attr;
}
add_filter('language_attributes', 'facebook_namespaces');
 
function facebook_sdk_anchor() {
  echo '<div id="fb-root"></div>';
}
add_action('wp_footer', 'facebook_sdk_anchor');

?>