Yahoo is one of the last large Web content providers to officially commit to using a DNT technology. The company said that the system will be site-wide and will cover the company s Right Media and interclick subsidiaries. Yahoo officials said that their Do Not Track implementation has been in development since 2011 and that it will be a simple way for consumers to turn on the DNT option. Some members of Congress have been pushing for the broad implementation of DNT, including Mary Bono Mack.
Source: https://threatpost.com/yahoo-implement-do-not-track-033012/76385/