Facebook has admitted that it tracked users who do not have an account with the social network, but says that the tracking only happened because of a bug that is now being fixed.The social network hit out at the report commissioned by the Belgian data protection authority, which found Facebook in breach of European data privacy laws, saying that the report “gets it wrong multiple times in asserting how Facebook uses information”.
http://www.theguardian.com/technology/2015/apr/10/facebook-admits-it-tracks-non-users-but-denies-claims-it-breaches-eu-privacy-law