Through detailed pattern-matching and, potentially

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machine learning on large data sets, the engines may be able to form distinctions about what constitutes a "legitimate" and "editorially-given" link that's intended as an endorsement vs. those that may be placed surreptitiously (through hacking), those that are the result of content licensing (but carry little other weight), those that are pay-for-placement, etc. #11 - Geographic Location The geography of a link is highly dependent on the perceived location of its host, but the engines, particularly Google, have been getting increasingly sophisticated about employing data points to pinpoint the location-relevance of a root domain, subdomain or subfolder.


These can include: The host IP address location The cou saudi arabia mobile phone numbers database try-code TLD extension (.de, .co.uk, etc) The language of the content Registration with local search systems and/or regional directories Association with a physical address The geographic location of links to that site/section Earning links from a page/site targeted to a particular region may help that page (or your entire site) to perform better in that region's searches. Likewise, if your link profile is strongly biased to a particular region, it may be difficult to appear prominently in another, even if other location-identifying data is present (such as hosting IP address, domain extension, etc).


#12 - Use of Rel="Nofollow" Although in the SEO world it feels like a lifetime ago since nofollow appeared, it's actually only been around since January of 2005, when Google announced it was adopting support for the new HTML tag. Very simply, rel="nofollow", when attached to a link, tells the engines not to ascribe any of the editorial endorsements or "votes" that would boost a page/site's query independent ranking metrics. Today, Linkscape's index notes that approximately 3% of all links on the web are nofollowed, and that of these, more than half are sites using nofollow on internal, rather than external pointing links.