Override Wordpress discussion settings missing

Hi,

my "Override Wordpress discussion settings" is missing, is this normal?

I am trying to make it work like this: http://youtu.be/42UfDHIU9ZA?list=PLV1BcivFAIdtOy-6iY4Da_9Ol1qV5xPj4
But new comments from facebook does not show up in the WP post FB comments box.

Tommy