
The Belgian regulator's investigation found that the social network was tracking without their consent internet users who are not members of Facebook, using cookies and plug-ins for the social network placed on third-party websites. These non-members have not given explicit consent for Facebook to track their browsing, putting the social network in violation of Belgian and EU laws on the use of cookies and personal data protection.
While the Belgian regulator earlier attempted to negotiate changes to Facebook's practices with the company, Facebook rejected the Belgian authority over its activities, as its European operations are based in Ireland. Facebook is already the subject of a separate lawsuit in Ireland over whether it should be allowed to transfer personal data collected in Europe to its US operations.