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I think certain advertising companies use cookies to keep track of your browsing habits, and this is what Mobius Rex is worried about. I know of some ads that place a cookie in your browser's cache, even if you don't click on the ad. If you surf to another site that has an ad by the same company, they can examine the cookie they placed earlier, and see which site you've come from.
I'm glossing over the details, but that's pretty much what some companies do, hence some see the need for good cookie management.
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