I agree. I think there are really two levels of privacy. I would like to keep my Netflix preferences private in the sense of not posting it on my website (or Fa

I agree. I think there are really two levels of privacy. I would like to keep my Netflix preferences private in the sense of not posting it on my website (or Facebook or whatever). But, if someone was interested in sinking enough effort to deanonymise me so that they can embarrass me by revealing that despite my sophisticated world-cinema sub-titled exterior I did, in fact, rent Mamma Mia last weekend - well, I would just pity them for not having a life. In other words, privacy through obscurity is probably enough for most people in this case, and so asking people whether they want to opt out of the program is good enough - I think most people would stay in. Netflix can always pick another person in that age/gender/geographical bucket to replace a person who decided to opt out.