albo - 2:33 pm on May 18, 2012 (gmt 0)
Consider that it's not so much a "do not track" as a (as they phrase it in the options) "Do not base Suggested people to follow based on sites I have visited". And that this option applies only to Twitter users who visit via the website versus a Twitter-sponsored "app". (Many and perhaps even *most* users go with the "app".) Nonetheless, it's a pleasing step.