On the practical side of this, google has two separate menus for conducting targeted advertising opt-out. One for targeted advertising when you are logged in, and one for targeted advertising when you are signed out of google.
Now, there are a LOT of caveats. They use a cookie based system, so blocking their "don't advertise when you track me" cookies, using a different browser, different computer, etc. (even when logged in) breaks your opting out.
Thanks for those links. It seems that corporate promises are rather fluid.
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