Where do Yahoo! Web Analytics get its Demographic data?

Well first of all Yahoo! has some 550.000.000 unique visitors every month and those visitors are giving their data away by signing and out of various services such as Flickr, del.icio.us, Kelkoo (a shopping search engine which operates in 10 European countries), Yahoo! Answers, Yahoo! Messenger, Yahoo! Mail serving over 260 million users, Yahoo! GeoCities, and Yahoo! Finance, Yahoo! Games, Yahoo! Gallery, Yahoo! Buzz and more. This data is a sample of information collected across the Yahoo Network.

A list of some of the Yahoo! owned sites and services:

http://answers.yahoo.com/question/index?qid=20081007214624AAfLXEF and

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  1. Does anyone know how reliable this data is on International level? Is it US based useres mostly or?

  2. How my web can use this analytics, do I need to pay something?

  3. Send us an email and we might be able to help – info [at] nordicemarketing.com and we might be able to help

  4. Their network is indeed huge. Thank you very much for sharing this analytics source data with us.