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Possible Duplicate:
alexa and compete


i'm trying to understand idea of traffic monitoring sites such as alexa.com , which can monitor traffic for any site in the internet (although if it not registered account underit and didn't put any code to alexa for help it to monitor this site traffic) ??

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migrated from stackoverflow.com Mar 10 '11 at 13:11

This question came from our site for professional and enthusiast programmers.

marked as duplicate by John Conde Mar 10 '11 at 14:14

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Just like TV show rating companies do - take a sample and multiply it up. – UpTheCreek Mar 10 '11 at 14:02

They gather their data through users who install the Alexa Tool Bar. See their Company page for details.

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