Every page you visit that has a like button on it, facebook knows you've visited that website.. porn, news, whatever.. they know what you're looking at on the i

Every page you visit that has a like button on it, facebook knows you've visited that website.. porn, news, whatever.. they know what you're looking at on the internet. Even if you don't have a facebook account, you still get a cookie so they follow you online and build a profile of your browsing habits.