Second update:
Applied the above solution with no avail and found a simple solution that works.
Go to the following link.
https://developers.facebook.com/tools/debug to determine if Facebook detects your og:image. If not, add some code.
Explanation
----
With the new Facebook Open Graph stuff, you can define a thumbnail for that page in your "head" of the form<meta property="og:image" content="[image url]"/>