EFF states, “It’s clear that Facebook does extensive cross-domain tracking, with two types of cookies and even without. With this data, Facebook could create a detailed portrait of how you use the Internet: what sites you visit, how frequently you load them, what time of day you like to access them. This could point to more than your shopping habits – it could provide a candid window into health concerns, political interests, reading habits, sexual preferences, religious affiliations, and much more.”