They can and will, but that's the least of your worries about Facebook. Every page that has a "like us on facebook" or "share this on facebook" - estimates are

They can and will, but that's the least of your worries about Facebook. Every page that has a "like us on facebook" or "share this on facebook" - estimates are 50% of the web pages - reports your web surfing habits to Facebook. Whether or not you have a facebook account. uBlock Origin, AdBlockPlus, Disconnect, Ghostery, etc. are your friends.