Google has added a new Manual Action penalty – image mismatch. You can receive an image mismatch penalty when the images on your site do not match what is shown in the Google search results. This happens when you are serving Google one image and the user another image. This form of spamming is called “cloaking”.
If Google notices that your site has mismatched images, they may apply a manual action to the affected portions of your site, which will affect how your site’s images are displayed in Google. Actions that affect your whole site are listed under Site-wide matches in the Manual Actions section of your Google Webmaster Tools. Actions that affect only part of your site are listed under Partial matches.
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