By ads, they mean adverts. Now I don't know about you, but I never come online for adverts, especially not to Yahoo Answers, or YouTube, or Google, or Facebook. In those places all adverts just get me cross. And to have some creepy voyeur spying on all I do to justify them deciding what I want to see adverts for, just gets me even more cross.
So am I alone in that? Or do most people actually WANT to be spied on to justify all these unwelcome adverts?