As stated, third-party cookies usually do not contain, in themselves, data that identifies you as a particular person. However, Amazon, Facebook, and other first-party cookie vendors know who you are because you signed in. Only one of them needs to reveal your identity to the ad server and your identity can then be correlated with your IP address. At that point, the ad server and potentially all of its clients know who you are. Are you concerned about the invasion of your privacy that third-party cookies enable? Explain your answer.