The operator of a website that features a Facebook ‘Like’ button can be a controller jointly with Facebook in respect of the collection and transmission to Facebook of the personal data of visitors to its website
Court of Justice of the European Union - PRESS RELEASE No 99/19 - Luxembourg, 29 July 2019. Here the document: https://curia.europa.eu/jcms/upload/docs/application/pdf/2019-07/cp190099en.pdf