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went live at 8:pm PST in the USA

if

This Patent was filed in 12/03 but made public 4/05

It is possible being applied in the latest ALOs

http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220050071741%22.PGNR.&OS=DN/20050071741&RS=DN/20050071741

Basically:

The AGE of a WebPage or (Document)
The Consistancy and Length of Time of the Backwards Links
The Frequency of Updates to Web Page
The Click through SERPS rate
The harmony of keywords

If you have seen this referrer in your Trackers
http://www.google.com/url?sa=D&q=

This redirect URL may be analyzing the click-thru rates in Search Queries

DirectHit was the first to experiment with this Theory of Click-Popularity

http://web.archive.org/web/*/http://www.directhit.com

http://searchenginewatch.com/sereport/article.php/2165041