I installed your plugin and activated it. I went to a post in my WordPress site that I know has a featured image. I copied the URL.
I pasted it into my wall in Facebook. For example, this URL: http://immizen.com/2013/02/13/obamas-reelection-bringing-fox-news-down-sotu-fox-news-rating-down-47/
but instead of showing the featured image of the post (http://immizen.com/wp-content/uploads/2013/02/Fox-News.jpg) it shows an advertisement image that appears in the right hand widget.
Please help me get it to show the "featured image"