It is all part of targeted advertising by tracking your online behavior and it is not irrational to feel creeped out by this. A few months ago, Facebook partne

It is all part of targeted advertising by tracking your online behavior and it is not irrational to feel creeped out by this. A few months ago, Facebook partnered with some of the largest data companies such as Acxiom, Blue Kai, Epsilon, and Datalogix to help improve their targeting. (https://www.facebook-studio.com/news/item/partner-categories-a-new-self-serve-targeting-feature https://www.facebook-studio.com/news/item/partner-categories...) One way to help prevent targeted advertising and companies collecting behavioral data about you is to use a browser plugin called Ghostery. (http://ghostery.com http://ghostery.com) Disclaimer: I work for Evidon, the owner of Ghostery.