[Plugin: Facebook OG Meta Data] Does not create og:image thumbnails

I’m using your code (installed the zip file) but the og:image is never the thumbnail of a picture on the post. It’s always the specified image that it defaults to. Unless I’m not making thumbnails correctly… all my posts are gallery. http://www.warriortom.com (just getting started)

http://wordpress.org/extend/plugins/add-facebook-og-meta-tags-paulund/