I do have a problem with the Facebook Comments plugin: I did everything as written on the wiki, but I can't see the comments at the end of every article. I can just see the text "comments" at the end of the post and nothing else. I thought was a theme problem so I contacted the theme creator but he said that he tried the plugin and it works great.
You can see the result at the end of this post in my site http://www.geekupyourlife.org/oreilly-rilascia-gratuitamente-alcuni-libri-sulla-programmazione/
If you have any suggestion will be great! Thank you so much in advance.