Over the past few months the ‘Official Google Blog’ has been posting an occasional series of articles about search quality, explaining what the team at Google do and how they develop and maintain the quality of their search rankings. Of course they aren’t revealing the inner secrets of Google’s algorithm, but there is some more openness being shown to explain to users what some of the main issues are that Google considers important.

The first post back in May provided a background to the search quality team at Google and explained what they do. It introduces the series of blog posts that will help to explain more about the process and outlines the factors behind the ways of determining ranking position and trying to relate a user’s search query with the correct set of results. It explains how different parts of the search team work on developing and evaluating the ranking process, adding new features and fighting ‘webspam’.

The second post appeared over a month later at the start of July and explained more about the process of Google’s ranking system. This is based on 3 basic principles that are outlined in some more detail – namely that the best locally relevant results are served globally, the ranking system is kept as simple as possible, and that there should be no manual intervention.

The next blog post was a more technical look at the issue of Information Retrieval and how this technology is used to determine results based on understanding pages, search queries and user intent. The most recent post earlier this month describes the developments in the search experience and how Google has tried to enhance the ways that results are presented to users, including spelling corrections, the presentation of results and text ‘snippets’ to enable users to assess the listings, and also query refinements or suggestions.

Google will be continuing this series in the future and although this is very much a PR exercise, there are some useful insights in these articles to explain how the search engine works. If you’d like to find out more about Google’s search quality blogs and the implications for your online business then please contact us for more details.

One of the most heated debates in the search engine marketing sector can be generated by Google’s PageRank and specifically the green PageRank indicator shown on the Google Toolbar – is this really a useful indicator of how Google views each web page, or should it be completely ignored as an irrelevant distraction? The question is also raised as to what purpose this indicator serves for most web users and why Google even bothers to display this.

Google’s trademarked ‘PageRank’ algorithm and underlying technology is one of the main foundations of the search engine developed by Sergey Brin and Larry Page and was also a core factor that enabled Google’s search results quality to stand out from existing search engines when it first launched in the late 1990′s. Google’s own corporate pages describe PageRank as follows:

PageRank reflects our view of the importance of web pages by considering more than 500 million variables and 2 billion terms. Pages that we believe are important pages receive a higher PageRank and are more likely to appear at the top of the search results. PageRank also considers the importance of each page that casts a vote, as votes from some pages are considered to have greater value, thus giving the linked page greater value. We have always taken a pragmatic approach to help improve search quality and create useful products, and our technology uses the collective intelligence of the web to determine a page’s importance.

The underlying PageRank algorithm is a complex mathematical formula, which is then simplified by the short indicator bar on the Google Toolbar, where the green colour filling the bar indicates the PageRank ‘score’ between 0/10 and 10/10. New sites will start with a completely clear bar with no score and then develop a higher PageRank as the site gets indexed and starts attracting links from other domains.

The PageRank score on the Toolbar is a snapshot and an occasionally updated figure – Google’s Matt Cutts recently alerted people in his blog that a new update was being posted and back in 2006 had provided more information about the Toolbar indicator with answers to some readers’ questions. It’s clear that it would be wrong to place too much emphasis on this Toolbar figure for each website and web page, but it’s also short-sighted to dismiss it completely when it does provide some degree of information from Google’s perspective.

So the Google Toolbar shouldn’t be a figure of primary concern but a useful indicator of relative performance and potential development. It does give website marketers a view of their own and competitors’ web pages and how pages within a site hold different PageRank scores. It shouldn’t be a core driver of an SEO strategy but perhaps confirmation of how the search marketing support for a site is developing its potential performance on Google.

If you’d like to know more about Google’s PageRank system or the Google Toolbar, please contact us for more information.