To get a sense of how ubiquitous this tracking is, here is the full, massive list of URLs that are connected in some way with Facebook.
And the company’s infamous “ social graph” knows so much about you that it can track you even if you’re logged out or have deleted your account. It can track you when you visit unrelated sites that have a Facebook module. Facebook can track you on the other sites it owns, like Instagram and WhatsApp.
