functions.php

<?php
/**
 * Facebook Comment Moderator
 * @link http://extracatchy.net/add-facebook-comments-in-wordpress/
 */
function be_facebook_comment_moderator() {
  
  // Using your individual facebook ID
  echo '<meta property="fb:admins" content="{YOUR_FACEBOOK_USER_ID}" />';
  
  // Or using a Facebook App ID
  echo '<meta property="fb:app_id" content="{YOUR_APP_ID}" />';
  
}
add_action( 'wp_head', 'be_facebook_comment_moderator' );