When the GDPR (General Data Protection Regulation) rules were published, Facebook started taking measures to comply. By the time the privacy rules were going into effect on 25 May 2018, Facebook was GDPR compliant. That said, GDPR compliance is not just for Facebook. As a marketer on the platform, as long as you collect user data, you should be GDPR compliant. This is necessary if your online business serves even just one European visitor. In summary, you should ensure that you clearly inform visitors how you’ll use their data, ask for their consent before collecting it, give them access to it whenever they want and allow them to edit and delete it whenever they want. Read more about it here.