A post whose source is a direct link to an Ameba image, rather than to the Ameba post containing the image. These are considered Bad Links because there's no way to find the original Ameba post from the image link.
If you see this warning while uploading, it means you should paste the link to the Ameba post on the upload page, not the image itself.
Posts missing this tag can be found using this search: {{source:*stat.ameba.jp -bad_ameba_link}}