I threw together a quick script a while back to show the top 100 most liked posts. It isn't pretty but it should provide you with a starting point for something better.
<?php
define("IN_MYBB", 1);
define("NO_ONLINE", 1);
require_once "./global.php";
$query = $db->query("SELECT l.pid, count( * ) AS likes, p.subject, p.username, p.uid
FROM `mybb_g33k_thankyoulike_thankyoulike` l
LEFT JOIN `mybb_posts` p ON l.pid = p.pid
GROUP BY l.pid
ORDER BY likes DESC, l.pid ASC
LIMIT 100");
while($data = $db->fetch_array($query))
{
echo '<br />Post #<a href="/showthread.php?pid='.$data['pid'].'#post_'.$data['pid'].'">'.$data['pid'].': '.$data['subject'].'</a>
by <a href="/member.php?action=profile&uid='.$data['uid'].'">'.$data['username'].'</a> with '.$data['likes'].' likes.';
}