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Dec 11
2008
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Evolution of the Google Search AlgorithmPosted by Joseph Leon in seo |
In the beginning Google used "trust" to judge and rank a page. This trust was emphasized by the age of a link or site. Older, more trusted links and sites were ranked higher. This helped combat against new sites spamming links to improve site rankings. The major problem was that this system did not address new content. New pages that were legit were at a severe disadvantage in that they did not have trust built up with the Google algorithm. So users who sought new data about a subject might be bombarded with old irrelevant data. This issue came to its zenith when Google finance was launched and it did not rank for its own name. Enter QDF...
QDF stands for Query Deserves Freshness and is a new model Google added to reward activity with a certain topic. Freshness is used to describe how many recently created or changed pages are included in a search. This is the center of a huge search debate. Is it better to rank fresh information or a time tested page? In the past Google gave precedence to older pages.
QDF revolves around determining if a topic is "hot". If blogs and news sites are publishing lots of new content about a specific topic QDF will determine if this topic is what users want to view. QDF is basically a measure of global enthusiasm for a topic. The QDF model takes a number of factors into account:
- search volume
- news coverage
- blog coverage
- toolbar data (maybe)
Google has a patent on the QDF methods. It gathers data including a sampling technique that allows them to gather statistically accurate data without having to trawl through all the logs for a particular query.
QDF rewards those that build high quality sites which present viewers with meaningful and fresh content. This means a site needs to be active with fresh content. You can utilize the QDF model if you write meaningful articles and keep updating blogs. Once a page rank is up then a strong self reinforcing site has been established which ranks highly with trust as well as QDF.
An example of QDF at work might be a site about Ehud Barak, a Jewish man born in a kibbutz. He might have been high on the search before Barack Obama came along. Then millions upon millions of new sites and articles were flooded on the net during the race for the 2008 US presidential elections. Barack Obama will now beat Ehud Barak if you search for "Barack" on Google. The moral of the story: Do not neglect fresh content or you will be neglected on search queries.

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