When posting to my fb timeline or page, the plugin grabs the image off an ad in my right hand sidebar. I have tried using both the featured image and my themes thumbnail shortcode.
The image it grabs is the filemail logo at the bottom right: http://www.paafeltet.org/?p=3917&lang=en
It would be sooo nice if the plugin had even the slightest bit of interaction. Like choosing where to post (maybe you dont want to send every WP post to fb) or choosing which image to display on fb (maybe there are multiple images). As is all I can do when posting is add some text, which is rather pointless as the text should already be in the WP post. Why would you need to add text to a post before showing it on fb? What kind of info would you need on fb that you don't want to display in the original post on WP?