Google Patents and Ranking?
Well, I just read an article an it brought up a 2 new Patents that Google filed, which you can read about here: Document Scoring Based on Traffic Associated with a Document and Document Scoring Based on Query Analysis.
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Web page creation date
Changes and updates of a web page
Analysis of search queries
Links, link texts and the changes of the links
Website traffic
User behavior
Web page topics
Domain related information
Pretty wild and logical if you ask me. All search engines should use some of those as ranking criteria but they will hopefully use it with a grain of salt. You wouldn’t want to get dinged because your site doesn’t update for a long period of time, if it was ranked highly originally.