pcause writes: Most of the consumer web tracking is done by third party cookies. An ad network or ad targetting service puts cookies on your system to watch where you go and uses this ti figure out what to give you for ads and to build a profile. All of the major browsers have the ability to block third party cookies. The question is why they do't make this the default behavior, as doing so would immediately reduce unwanted tracking, especially if Flash respected this setting.
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