[Plugin: Facebook Comments for WordPress] Facebook comment_count

<?php
$args=array(
  'orderby'=>'comment_count',
  'order'=>'DESC',
  'post_type' => 'post',
  'post_status' => 'publish',
  'posts_per_page' => 6,
  'caller_get_posts'=> 1,
'cat' => 28
);
$my_query = null;
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {

  while ($my_query->have_posts()) : $my_query->the_post(); ?>
  <div class="videopart2">
<div class="thumbnail2">
<a href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><img src="<?php echo get_post_meta($post->ID, "bigthumb", true); ?>" width="180"  alt="<?php the_title(); ?>" />

</a>
</div>
<div class="fpost">
<h3><a href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h3>
</div>
</div>

 <?php
    the_content();
  endwhile;
}
wp_reset_query();  // Restore global post data stomped by the_post().
?>

When im using comment_count query the facebook count isnt going in. Is there any alternative for these?

http://ww.wp.xz.cn/extend/plugins/facebook-comments-for-wordpress/