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OK, a little update on the link rel image to work on facebook...
They seem to have changed protocol so now you should add:
xmlns:og="http://opengraphprotocol.org/schema/"
to your existing theme. Example:
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="<{$xoops_langcode}>" lang="<{$xoops_langcode}>" xmlns:og="http://opengraphprotocol.org/schema/">
and then instead of link rel tag use this tag:
<meta property="og:image" content="http://yoursite.com/thumb_logo.jpg"/>
You can choose other path to the image of course...