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Alexa Rank is a measure of 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. 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 (or so) by using values collected for 'reach' and
'page visits' and then factors in the values for the prior three months.
Updates appear to occur every 3 days or so.
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