On the Internet, we generate data every day that we often think is harmless our likes, our location or our browser history. But companies that own this data can use AI algorithms to derive intimate information from it. Do we suffer from mental illness? Do we abuse substances? Are we rich or poor? Such algorithms are used to treat people differently in an automated way when it comes to the price of insurance, the selection of applicants in hiring processes, decisions about credit or immigration. The combination of Big Data and AI is currently producing a new technology of population management. This development leads to a new form of power in our societies, to which we all contribute through our data and which we therefore need to discuss critically and ethically.