It was the actual "share" from Facebook, not the one from Add Link to Facebook (that one comes in Spanish if I turn it on). Anyways, that is gone now.
The Link API does a good job. Apparently, it doesn't group the posts but once the article is publish to Facebook I wasn't able to change (update) thumbnails, excerpt or add message.
Anyways, I'll keep waiting for your updates. Thanks for the excellent job!