Indeed, millions of people now do set specific privacy preferences within Facebook, opt out of being tracked, and the like. At the same time, they gladly share data with vendors and even track their own data – whether airline mileage or steps walked, check-ins at their favorite venues (especially if they can earn discounts or special offers), or their movie, music, or book purchases.
其实，数百万人现在确实在Facebook上设置隐私偏好，退出内容追踪等诸如此类的服务。与此同时，他们欣然与供应商共享甚至自我追踪航空里程、行走步数、进入喜爱场所的次数等数据（尤其如果因此可以获得折扣或者特别优惠），这些人还记录自己购买的电影、音乐和书籍。