https://phys.org/news/2018-05-spanish-consumer-group-sue-facebook.html

The claim will represent "all Facebook users in Spain", not just those affected by the Cambridge Analytica data sharing scandal, in which the British consultancy obtained the data of millions of Facebook users for political purposes.

OCU said it believes "Facebook violated legislation regarding data protection", because it did not tell users how it would use their data, nor ask for their authorisation.