Page Quality
Page Quality, or simply PQ, is a system used to rank websites on the internet based on their quality. 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