I came across this YouTube video today, and its quite scary. I will admit though that I haven’t taken the time to confirm its quotes, claims and references. But its chocking if true. The focus is primarily on the American user-base, and how statistics from your preferred music, movies, books, politics etc. Can be used to, among other things, generate revenue among different markets. All stated in the terms of service.
Please watch the YouTube video in full, and make your own judgment.