If you use IE
Put
*.link4ads.com
*.247media.com
into your 'restricted zone' list.
These site you might as well put in also
*.doubleclick.net
*.zdnet.com
*.pcmag.com
just to name a few.
Also, go to Privacy menu in IE6, use Advanced settings, and Enable all First-party cookies, Reject all Third-Party cookies.
Do NOT use their own policies because using their policy, even if those are 3rd party rubbish cookies, they will accept it as long as they have a compact policy statement, which basically nearly all the ad company has.