JQuery Script to force certain og:image
If you have multiple Facebook og:images on a page that you cant alter here is a script to attempt to force Facebook to use a certain one.
<script> jQuery(document).ready(function() { jQuery("meta[property='og\\:image']").attr("content", "http://imagelink/commons/thumb/8/82/Dell_Logo.png/1027px-Dell_Logo.png"); }); </script>