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Alexa Rank is a form of measurement for
web site popularity. The Alexa Rank ranges from 1 to the number of sites
in its database (0 = unranked). Owned by Amazon.com, the Alexa Rank
utilizes the optional Alexa toolbar to track each and every web site
visit by a toolbar user. Each visit to a site counts as one visit (called
'reach'). Multiple visits to the same site during a day count only as
a single visit. Alexa also tracks the number of sub page visits to each
web site (called 'page views'). The Alexa Rank is calculated daily by
using values collected for 'reach' and 'page visits' and then factors
in the values for the prior three months.
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