Are you a member of any Yahoo! groups? You should …:
Are you a member of any Yahoo! groups? You should know that Yahoo! is tracking your movement even outside the Yahoo! network using Web beacons. Click here to opt out.
And once you do that, be careful you don’t click the button or you undo it and opt back in. I’m not sure it’s fair to call it deceptive but if you’re in a hurry — as I was — you might not read it through.
And of course, how do we know anything happened?