Very strange issue here but that is! I've OpenGraph Meta Tags up and running. All is ok with authenticated users: they click "I like" (provided by fb_social, opengraph support disabled!) and the link is shown on their FB profile together with associated image.
When an anonymous user clicks "I like", the link is there but no thumbnail shows! I looked at the HTML meta and og:image is there. URL is right (tested!).
Any clue? :(
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Comment #1
circuscowboy commentedworking on a patch to add imagecache to the og:image which will most likely solve this problem.
http://drupal.org/node/1181104