With a large enough database of potential faces (see VKontakte), you might be able to use this tool to upscale blurry images and match them to a short list of c

With a large enough database of potential faces (see VKontakte), you might be able to use this tool to upscale blurry images and match them to a short list of candidates. Other intelligence could then lead you to the actual person in the blurred image. Scary implications.