Asking won't work
Simply asking a company to stop tracking obviously won't do the trick. That will be as effective as the Do Not Call list. The only thing left is active blocking via the already-mentioned browser extensions. If the marketers think they have a right or an obligation to force ads on us then it is our job to prevent that attempt. Giving the ads content based on what we searched recently or what site we viewed does not make the intrusion any more palatable.
John M - Cranky network guy