Interesting article: http://www.zdnet.com/article/pgp-co-founder-the-biggest-privacy-issue-today-are-online-ads/
I prefer not determining which one is worse than the other, but rather determining how to get both of them to lessen their intrusion while not harming the real needs of both. That isn't the easiest question in the world to answer, and I don't see anyone agreeing on anything anytime soon.