Would like to bring to your attention the problem of referrer spam: http://www.wired.com/culture/lifestyle/news/2002/10/56017
Your plugin, though greatly appreciated, has made my site vulnerable to this malicious form of advertising.
I notice that this issue was brought to your attention on October 4, 2007 (see below for a comment from your own site).
I suggest that for future versions of Counterize you implement the rel=”no follow” hyperlink structure to the Referrer section: http://en.wikipedia.org/wiki/Nofollow
Furthermore, it would be considerate to add an administrative option to turn off referrer stats.
I removed the following section of code to achieve the same result:
<h2><?php echo __("Most seen referers ",'counterize') . "(" . $amount2 . ")"; ?></h2>
<?php counterize_most_visited_referrers($amount2,$width); ?></div>