Activist Max Schrems argued that Facebook's contracts do not protect data to European levels.
The European Union's (EU) top court on Tuesday ruled in favour of a Romanian gay man's right to have his American husband live with him in Romania.
The Court of Justice of the European Union (ECJ) said Max Schrems could bring a case against Facebook and benefit from consumer law as an individual.
Judges at the Luxembourg-based court will decide on Wednesday whether Uber provides transport services, online services or a combination of both.
Privacy activist and 25,000 Facebook users demand right to file class-action suit against the company
Schrems's lawsuit concerns alleged violations of privacy by Facebook through its use of personal data and tracking of users on external pages, among other things.
EU citizens in UK will still have to apply and pay a fee around £65 and are likely to get some form of identity card or document confirming their status.
The Court of Justice of the European Union (ECJ) said its ruling was based on the view that holding traffic and location data en masse allowed "very precise conclusions to be drawn concerning the private lives of the persons whose data has been retained".
The United States can join a landmark case on the legality of cross-border data transfers, an Irish court ruled on Tuesday in a move that gives U.S. authorities a platform to defend their surveillance laws before the European Union's top court.
Telecoms operators in the European Union may be required to retain customer communications data as long as it is strictly necessary to fight serious crime and does not unduly interfere with privacy, an adviser to the top EU court said on Tuesday.