The only way to escape tracking at this point is not to use Internet. It doesn't come as a surprise that Facebook tracks all visitors to a third party websites. 

If you do not want to appear on CCTV camera, do not get out of the house.

The researchers now claim that Facebook tracks computers of users without their consent, whether they are logged in to Facebook or not, and even if they are not registered users of the site or explicitly opt out in Europe. Facebook tracks users in order to target advertising.

The issue revolves around Facebook’s use of its social plugins such as the “Like” button, which has been placed on more than 13m sites including health and government sites.

Facebook places tracking cookies on users’ computers if they visit any page on the facebook.com domain, including fan pages or other pages that do not require a Facebook account to visit.

When a user visits a third-party site that carries one of Facebook’s social plug-ins, it detects and sends the tracking cookies back to Facebook - even if the user does not interact with the Like button, Facebook Login or other extension of the social media site.

EU privacy law states that prior consent must be given before issuing a cookie or performing tracking, unless it is necessary for either the networking required to connect to the service (“criterion A”) or to deliver a service specifically requested by the user (“criterion B”).