As you probably have seen in the news lately, Facebook track all webpages you are visiting (those that have like buttons and other FB related information).

It is possible to block this if you are using Firefox and AdBlock Plus.
By adding this filter no other pages can send data to FaceBook or collect any.
(It is still of course possible to surf to facebook directly)


||facebook.*$domain=~facebook.com|~127.0.0.1