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What is “Do Not Track”?
Do Not Track (DNT) is a privacy preference that users can set in their web browsers.
The United States Federal Trade Commission has endorsed DNT as a simple way for users to inform integrated web services which offer content across the Internet (such as buttons, widgets, and other embedded features) that they do not want certain information about their webpage visits collected across websites when they have not interacted with that service's content on the page.
The DNT browser setting is now supported by recent versions of major browsers, including Firefox 5+, Internet Explorer 9+, and Safari 5.1+. If you are using Chrome 17.0 or higher, there is a third-party extension that enables DNT.