Facebook comment plugin not working

Question

I have included HTML5 code in 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 displays correctly, and I can comment, BUT each Comment seems to be "local". Meaning, when one User comments, only he can see his comments and no one else. I tried this with several different users, and each user sees only his comments. What could be the problem?

Answer 1

"MY_APP_ID" is probably associated with an application that is currently in sandbox mode. Such application activity is displayed only for users, administrators, testers, etc. Check the APP settings for this property and disable sandbox mode.