Tracking a Facebook Share (no replies)

Hi all,

I tried to track the click on a facebook share button inserted on our website. After reading several forums I tried it with goal tracking and event tracking. With goal tracking I had no success at all, piwik never counted a conversion. With using the trackevent I got 1 hit, after that it never worked again. Any idea what I should change in my html code (see below) to track the click on the button? I also tried it after deleting all cookies and with a different ID, but never got a count.

Thanks!
Ina

<div id="fb-root"></div>
<script type="text/javascript">// <![CDATA[
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.0";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
// ]]></script>
Tracking facebook<br><br>
<div class="fb-share-button" data-href="http://www.happygohamburg.com" onclick="javascript:_paq.push(['trackEvent', 'Facebook', 'Share']);"></div>
</div>