On 29 July 2019, the European Court of Justice (ECJ) issued its judgement on Case C-40/17 (the “Fashion-ID” case). In its ruling, the ECJ held that operators of websites embedding Facebook’s “Like” button act as data controllers jointly with Facebook in respect of the collection and transmission to Facebook of the personal data of visitors to the relevant websites. In relation to these processing activities, the website operators must inform their website visitors about the data processing activities for which they act as a joint controller with Facebook, must establish a lawful basis for these processing activities and, where applicable, must collect relevant consent from the website visitor.