I have the ShareThis module installed which works fine, and when posting to FB all works fine. There is an issue when posting that the module pulls images to post in thumbnail form and the images that it calls first/primarily are from an "ad" sidebar block, where I have coded them in a running list of <divs>. Is there a way to 'promote' site/article content images into that FB thumbnail pull? Do I add more images inside the content? Is there a way I can bury the sidebar pics a little deeper?

Thanks!