Topical Relevance There are numerous ways the engines can run topical analysis to determine whether two pages

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These can include (but are certainly not limited to): A large number of shared, reciprocated links Domain registration data Shared hosting IP address or IP address C-blocks Public acquisition/relationship information Publicized marketing agreements that can be machine-read and interpreted If the engines determine that a pre-existing relationship of some kind could inhibit the "editorial" quality of a link passing between two sites, they may choose to discount or even ignore these. Anecdotal evidence that links shared between "networks" of websites pass little value (particularly the classic SEO strategy of "sitewide" links) is one point many in the organic search field point to on this topic.


#8 - Location on the Page Microsoft was the first engine to saudi arabia mobile phone numbers database reveal public data about their plans to do "block-level" analysis (in an MS Research piece on VIPS - VIsion-based Page Segmentation). Block Level Analysis Since then, many SEOs have reported observing the impact of analysis like this from Google & Yahoo! as well. It appears to us at SEOmoz, for example, that internal links in the footer of web pages may not provide the same beneficial results that those same links will when placed into top/header navigation.


Others have reported that one way the engines appear to be fighting pervasive link advertising is by diminishing the value that external links carry from the sidebar or footer of web pages. SEOs tend to agree on one point - that links from the "content" of a piece is most valuable, both from the value the link passes for rankings and, fortuitously, for click-through traffic as well.