Quote:
Originally Posted by Claire.XXXBiz TV
alexa is a good indicator as it measures all sites using the same method(as used by tv etc) a sample audience ,thats a simply fact. 
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no, the "sample audience" that they are polling is much further away from random then would be acceptable to make their data useful for anything
alexa bases its "polling" on users that have chosen specifically to install the alexa toolbar, they do not have anywhere close to a sampling of typical internet users in their data