The Alexa Toolbar is a program written by Alexa Internet that users install into their browsers. Every time the user changes pages, the Alexa toolbar communicates with Alexa servers to retrieve information which is then displayed in the Toolbar. he usage paths of the collective Alexa community- this is the most important source of our information, since these paths show us which websites our users believe are important and interesting.Clustering - the hundreds of millions of links on the Web can be used to find clusters of sites that are similar and relevant to one another. We mine this data by using custom databases to find and identify these cluster
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