Notice that it’s “opt out,” rather than “opt in.” The hope, natch, is that you won’t notice it at all.
Twitter Inc. said Wednesday that users will receive a notification when the setting is turned on and can opt out using settings on their phones. On iPhones, this setting is called “limit ad tracking.” On Android phones, it’s “opt out of interest-based ads.”
And people worry about the NSA.
(More details at the link.)