"Facebook mistreats its users. Facebook is not your friend, it
is a surveillance engine. For instance, if you browse the Web and
you see a 'like' button in some page or some other site that has
been displayed from Facebook.
Therefore, Facebook knows that your machine visited that page.
So, Facebook carries out surveillance over visitors to thousands of
different Websites, even for people who are not Facebook users. I
hope we will have something for free browsers to block Facebook
'like' buttons so that people won't be under surveillance.