Brian Atkins wrote:
>
> The technique is that DoubleClick pays the adult site to put a 1x1 pixel
> invisible graphic on their site. When your browser hits the site, it also
> loads the graphic which is served from DoubleClick's servers so your browser
> also sends your DoubleClick cookie (you do have one, don't you?) to them
> along with a referrer URL in the HTTP request that DoubleClick can then use
> to know what site you are at currently.
DoubleClick opt out:
http://www.doubleclick.net/company_info/about_doubleclick/privacy/privacy2.htm
Don't know if you trust it, but it's better than nothing.
--
sentience@pobox.com Eliezer S. Yudkowsky
http://singinst.org/beyond.html
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