Let's start with an example of 3rd party tracking: when we went to CareerBuilder.com, which is the largest online jobs site in the United States, and searched for a job, CareerBuilder included javascript code from 10 (!) different tracking domains: Rubicon Project , AdSonar, Advertising.com, Tacoda.net (all three are divisions of AOL advertising ), Quantcast , Pulse 360 , Undertone , AdBureau ...
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