Want to know more about an image? The TinEye reverse image search engine might be what you need. From the official blah, blah:
You can submit an image to TinEye to find out where it came from, how it is being used, if modified versions of the image exist, or to find higher resolution versions. TinEye is the first image search engine on the web to use image identification technology rather than keywords, metadata or watermarks.
Check out the Cool Searches page for a taste of what to expect.

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