From Seo Wiki - Search Engine Optimization and Programming Languages
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Sites that use this service are enhanced by a small box which displays the site's current PQ and gives the visitor an option to review the site by casting a vote - from 1 to 5.
The primary goal of the PQ initiative is to include the PQ rate into advanced search options in internet search engines where user could use it as a filter (e.g. return search results with PQ 3.5 or higher)
The PQ initiative started on March 30, 2006
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