Facebook Comment Plugin

Hi Guys

I hope someone will help me out on this ??
I am using this plugin https://developers.facebook.com/docs/reference/plugins/comments/ where you copy n paste the code into ur theme, which I done and works great = apart from one thing.

Well, when people make a comment, then on their profile the facebook is not displaying the current page site but rather the actual domain.com website. In a sense, is not showing the link to where the person has commented but instead linking to the main website.

This is the code:

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<div id="fb-root"></div>
<script>(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_GB/all.js#xfbml=1";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>

and then the actual comment code:

<div class="fb-comments" data-href="https://mydomain.com" data-width="600" data-num-posts="15"></div>

I am sure where must be something the .com in order for the plugin to catch / fetch the link from the current page.

Any ideas guys ??

Thanks