What is interesting about this update is that it is giving less of a priority to reference/ informational sites and is being more democratic about backlinks not to focussed on the trustrank of the baclinks or the site.
Could this have been a result of some of the persistent complaints made on their Engineers blog about the overemphasis on certain informational sites in SERPs.
For example: Look at the Top 20 results for SEARCH ENGINE OPTIMIZATION: (a very SEO'ed term)
http://www.google.com/search?as_q=search+engine+optimization&hl=en&num=20
Even Google's Webmaster Guidelines which stayed at #2 for months has fallen to #12 – as well as another very white hat SEO who fell from page one after three years.
Several SEOs who do engage very aggressively in link exchanges have actually risen a few spots after months of staying at the bottom of page one.
There are also several changes in the SERPs for the term HOME – which is a good way to measure how effective INTERNAL BACKLINKS are on the SERPs
http://www.google.com/search?as_q=home&hl=en&num=20
http://www.rankpulse.com/home?p0=on&p1=on&p2=on&p3=on&p4=on&p5=on&p6=on&p7=on&p8=on&p9=on
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In his latest blog post there are answers given about the importance of the Human influence in Google's SERPs – and a discussion with Google's VP of Engineering
http://www.mattcutts.com/blog/udi-manber-interview/ |