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Google Chrome pushes ahead with targeted ads based on your browser history
(www.theregister.com)
This is a most excellent place for technology news and articles.
But the point being that there is no way for an advertiser to see an individual's browsing history, nor estimate it with the demographics. You can see what the wide majority is searching for but not an individual.
Don't get me wrong, I'm not defending Google. I use Google services but I opted out of everything I could. I don't even have an advertising ID on their servers.