public static function wp_insert_comment($comment_id, $comment)
 {
     global $wp_filter;
     if ($comment->comment_approved == 1) {
         //posted by a WP user
         if (isset($wp_filter['wpak_cache_update_new_comment'])) {
             do_action('wpak_cache_update_new_comment', $comment);
         } else {
             WpakCache::delete_web_service_cache('wpak-delete-all-caches');
         }
     }
 }