Some web browsers (including Safari, Internet Explorer, Firefox, and Chrome) incorporate a “Do Not Track” (“DNT”) or similar feature that signals to websites that a browser’s user does not want to have his or her online activity tracked. If a website that responds to a particular DNT signal receives the DNT signal, the browser can block that website from collecting certain information about the browser’s user. Not all browsers offer a DNT option and DNT signals are not yet uniform.