safe_image.php is a file on Facebook's server, not your vB installation.
Something is wrong in a template or some modification. If you look at the url of the image
https://fbexternal-a.akamaihd.net/safe_image.php?d=AQAVPLhY-ai5IbcH&w=100&h=100&url=http%3A%2F%2Ffairtradetoba cco.com%2Fimages%2FFTT%2Fmisc% 2Fbookmarksite_stumbleupon.gif&crop
You'll see this part is what Facebook is receiving from your forum: &url=fairtradetobacco.com%2Fimages%2FFTT%2Fmisc%2F bookmarksite_stumbleupon.gif&c rop
http://fairtradetobacco.com/images/misc/bookmarksite_stumbleupon.gif
Something is causing the FB plugin to send this image instead of the path to the avatar. Whether this is a template issue or plugin issue I cannot say for certain.
Try creating a new completely blank Default Style and try liking a thread while using the default style. Does it still happen?
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