He was very evasive about Facebook tracking users outside of their FB site and mobile apps. Kept saying he doesn't understand the question and "team will get ba

He was very evasive about Facebook tracking users outside of their FB site and mobile apps. Kept saying he doesn't understand the question and "team will get back to you". It's unfortunate no one (that I've seen) brought up the presence of the Like button and Facebook comments on a large portion of the web, which means Facebook knows pretty much most of the sites and pages you visit (even if the site you visit doesn't include any FB widgets, but the next one you click to does, since they also track the referrer header).