How does Google use human raters in web search?

Can you provide more details on how Google uses ‘human raters’ as part of their algorithm? AJ Kohn, SF, CA Read more about search evaluation at Google: googleblog.blogspot.com Have a question? Ask it in our Webmaster Help Forum: productforums.google.com Want your question to be answered on a video like this? Follow us on Twitter and look for an announcement when we take new questions: twitter.com More videos: www.youtube.com Webmaster Central Blog: googlewebmastercentral.blogspot.com Webmaster Central: www.google.com