Tracking sites dont have the ability to know if, for example, a site about cancer was visited out of curiosity, or because the user actually has cancer, said Wills.

Profiling is worrisome on its own, but inaccurate profiling could potentially lead to issues with employment, health care coverage, or other areas of our personal lives.Once someone is in possession of your unique identifier, there is so much they can learn about you. And even if tracking sites do not use the information themselves, can they guarantee that it will never find its way into other hands? For these reasons, we feel this issue is something that we should to be concerned about.Does this make you concerned about using social media?Tell us in the comments.