White House technology officials could barely contain their enthusiasm. They said it was "terrific" that Twitter is supporting the new Do Not Track feature in web browsers. With just one clickm tweeters could stop Twitter from tracking the websites they visit.

The Obama administration said that was a good step toward protecting users' privacy on the Web. The White House unveiled a Consumer Privacy Bill of Rights in February. More than 500 companies, including Google, Yahoo, Microsoft and AOL agreed to begin offering the Do-Not-Track option by the end of the year.

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