"Do Not Track" (DNT) is gaining momentum. In 2007, CDT and a coalition of other public interest groups called on the Federal Trade Commission (FTC) to create a system that would allow consumers to avoid being tracked as they browse the Web. After idling for three years, the idea has reemerged. Last July, FTC Chairman Jon Leibowitz expressed support for DNT in Congressional testimony, and in December, the FTC staff advocated for DNT in its Preliminary Staff Report. We have also seen support for DNT in a House subcommittee hearing, proposed legislation, and submissions to the Internet Engineering Task Force (IETF) and World Wide Web Consortium (W3C).