How does Stackoverflow hide the URL of the new share on facebook etc
<p>When you create a post , over in the Left hand side under the vote up and vote down, is a new share on twitter facebook and linkedin.</p>

<p>How do they do that, is it just using javascript ?</p>

<p>Or something far more clever than say:</p>

<p>This : <a href="http://www.openjs.com/articles/ajax/target_url_hiding.php" rel="nofollow">http://www.openjs.com/articles/ajax/target_url_hiding.php</a></p>
