Written on 20 June 2010 by 
Here is the story of SEO in 2 pictures.
From 1994 to 2001 and the second one from 2002 to 2009.
We can see the weight of criteria used for ranking websites and pages in search engines.
This is not absolute truth but approx (who really knows 100% of the truth in SEO?).
Click on images to enlarge.
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