http://support.woothemes.com/entries/22533458-Customising-post-meta-using-custom-filters > Finished code snippets

gistfile1.php

<?php
  add_filter( 'woo_filter_post_meta', 'woo_custom_filter_post_meta', 20 );
  
  function woo_custom_filter_post_meta ( $content ) {
    global $wp_query;
    $current_count = $wp_query->current_post + 1;
    if ( $current_count == 1 ) {
      $content .= ' '.do_shortcode( '[twitter_follow username="woothemes"]');
    }
    return $content;
  } // End woo_custom_filter_post_meta()
?>