Fmag.gr is a photography-news oriented website. Every post has links at the bottom, "print this", "email this" and share on facebook, digg etc.
About a month ago, I saw a strange behavior. If someone was clicking on the "Share on Facebook" link, Facebook was parsing the article with wrong encoding. I couldn’t explain that because it suddenly happened without any change in the drupal code by my side. I was convinced that Facebook is the problem and it will be fixed soon. That did not happen.