[gordietbh]

if you use the following:

<if condition="!$GLOBALS['FIRSTPOSTID']">
<span style="float: left;" class="smallfont"><script type="text/javascript">
tweetmeme_style = 'compact';
tweetmeme_source = 'TwitterUsername';
tweetmeme_url = 'http://www.yourURL.com/vb/showthread.php?t=$thread[threadid]';
</script>
<script type="text/javascript" src="http://tweetmeme.com/i/scripts/button.js"></script></span>
</if>

it will only display the link for the first post in each thread.

setting "showthread.php?t=$thread[threadid]" will use the thread ID for each twitter post instead of the URL of the page being viewed.

The benefits of this are that if somebody views a thread by showthread.php?p=1234 or showpost.php?p=1234 they will all get classified under the same tweet. Otherwise you will have different counts depending on which URL a user uses to view the page.