Users hogging my blog

http://www.onlinemusicawards.org/

So at the moment, the front page shows new user posts(fresh) and featured user posts(hot). A post becomes featured when people keep liking it.

The site accepts front end posts which is all working fine. The problem I am having is people are trying to hog the featured posts section on the front page. I want to limit the featured posts to 1 post per user. The code I have so far in main.php is:

<?php

                        if( options::get_value( 'front_page' , 'type' ) == 'hot_posts' ){
                            if( options::logic( 'general' , 'enb_likes' ) ){

$blogusers = the_last_post_per_user;

if ($blogusers) {
  foreach ($blogusers as $bloguser) {
    $args = array(
    'author' => $bloguser->post_author,
	  'showposts' => 1,
	  'caller_get_posts' => 1
    );
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {

                   ?>
                                <li class="menu-item hot <?php echo $hclasses; ?>" ><a href="<?php echo $hot_url; ?>" ><?php echo options::get_value( 'menu' , 'featured' ); ?><span><?php echo options::get_value( 'menu' , 'featured_' ); ?></span></a></li>
                    <?php
                            }
                    ?>
                            <li class="menu-item new <?php echo $nclasses; ?>"><a href="<?php echo $news_url; ?>" ><?php echo options::get_value( 'menu' , 'fresh' ); ?><span><?php echo options::get_value( 'menu' , 'fresh_' ); ?></span></a></li>

   <?php }
  }
}
?>

It doesn’t seem to be having any effect whatsoever. Can anyone tell me where I’m going wrong?

Thanks