I integrated the HTML5 code onto my code:
<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/de_DE/all.js#xfbml=1&appId=MY_APP_ID";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
and
<div class="fb-comments" data-href="http://mydomain.com" data-width="470" data-num-posts="2"></div>
It is being displayed correctly and I can comment, BUT every Comment seems to stay "local". Meaning, when one User comments, only he can see his comments and no one else. I tried it with a few different users and each user only sees his own comments. What might be the issue?