Alexa Rank is a measure of web site popularity. The Alexa Rank ranges from 1 to the number of sites in its database (millions). An Alexa rank of 0 means that the site is not ranked. Owned by Amazon.com, the Alexa Rank utilizes the optional Alexa toolbar that has to be downloaded 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 only count 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 seem to occur every 3 days or so.
It is important to note that the data that Amazon uses to calculate Rank is entirely dependent on a user having downloaded the Alexa toolbar. For example, if site A has 100 visitors who all have downloaded the toolbar and site B also has 100 visitors, but only 20 of them have downloaded the toolbar, the rank of site A will be much higher than site B. Also, it is worth noting that the Alexa toolbar is not supported by the AOL/Netscape and Opera browsers and secure site visits (https) are not counted.
Amazon charges a small fee for Alexa Rank queries. Because of this and abuse by some users of this Siteometrics tool, we have set a limit of querying 10 URLS at one time and a CAPTHCA script has been added to prevent abuse of this tool.
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