Ed Felten, chief technology officer at the Federal Trade Commission, announced today at an Internet Week privacy panel that Twitter will now stop tracking user data from those who opt-out. According to The New York Times, which was first to report on the news, Twitter's tracking will be nixed with help from Firefox's Do Not Track feature.
Twitter confirmed Felten's statement in a tweet today, saying that the company "now supports Do Not Track." Twitter also commended the FTC for its "leadership on Do Not Track."
Twitter announces support for Do Not Track | Security & Privacy - CNET News