People condemn targeted advertising for its "creepiness" but the real issue is that we are giving private companies more power.
"Rather than caring about what they know about me, we should care about what they know about us. Detailed knowledge of individuals and their behavior coupled with the aggregate data on human behavior now available at unprecedented scale grants incredible power. Knowing about all of us - how we behave, how our behavior has changed over time, under what conditions our behavior is subject to change, and what factors are likely to impact our decision-making under various conditions - provides a roadmap for designing persuasive technologies. For the most part, the ethical implications of widespread deployment of persuasive technologies remains unexamined..."