Facebook like button is a web beacon. You don't even have to have a Facebook account for them to track you. They don't get it directly from the browser, every t

Facebook like button is a web beacon. You don't even have to have a Facebook account for them to track you. They don't get it directly from the browser, every time that "like" button is loaded it notes it in a database somewhere. https://en.wikipedia.org/wiki/Web_beacon https://en.wikipedia.org/wiki/Web_beacon