Social Discussion not syncronizing comments from facebook


I have Comment Plus with Social Discussion and Custom Comments Template activated.

At options, I have selected to Sync discussions from these services: Facebook and Twitter.

Scheduled for 1 hour.

Twitter is working, but Facebook don´t.

I have post a comment in the website using my facebook account and posting the comment to facebook. I later continue the conversation from Facebook.

Me and another facebook user write some comments from Facebook but the comments are not shown in the website Facebook tab.

Twitter yes, it is showing the comments made from twitter.

What can be wrong?