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where did you read that?
Only in some browsers.
From an advertisers view point here, he is getting very many more impressions because his sites are being put in front of people who NO longer need the products and services of that advertiser.
don't think so. i don't have analytics and still get IBAs... everybody does :(
So how do they track you and your "interests"?
As users browse websites in the AdSense network, including YouTube, Google stores an advertising cookie in a user's browser to understand the types of pages that user is visiting. This information is used to show ads that might appeal to your users based on their inferred interest and demographic categories.