Great question — answering as the UphillTech team:
After spending much time attempting to research this growing issue, we've come to the conclusion that there doesn't seem to be any one set of standards and rules when applying tracking pixels/cookies. In fact, it seems to be a topic that no one wants to talk about. The web's dirty little secret . Browser companies, though, are getting into the game with functionality which allows users to disable tracking cookies from being installed during their page visits. As a company, we have decided on two standard ideas when applying tracking pixels: Allow as few pixels as possible per page. - This idea stems from the fact that allowing too many pixels on a page not only adversely affects the...
Full answer by Strozykowski: https://webmasters.stackexchange.com/a/11160 (CC BY-SA 2.5).
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