Twitter has agreed to adopt Do Not Track, a privacy preference enabled by users who do not want their browsing behaviour tracked across websites. Twitter is the first major social service to endorse Do Not Track in this way.
Less than 1% of Firefox users have activated the "Do not track" option in the latest version of the browser according to the Future of Privacy Forum think tank. Jules Polonetsky, founder of the think thank based his claim on information from two unnamed ad networks who gave access to their data. Polonetsky also reports that some ad networks are recording how many times their servers are told not to track a site's user.