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Originally Posted by Trama

They probably already do. Take a look at google.com/ads/preferences and surprise yourself, they're usually pretty good at guessing.

i assume they go by cookies not logins--past searches, etc, becuase when you reset the browser it disappears. of course if you run your browser why logged in to gmail (or worse, if you use the login version of chrome) they already know how many stains in your underwear and all.