This lecture explores the multifaceted nature of privacy, delving into its definitions and implications in the realms of sociology, computing, law, and psychology. It discusses the close relationship between privacy and technology, emphasizing the need to reconsider privacy in the face of technological advancements. The lecture also covers Solove's privacy taxonomy, the definition of personal data according to the EU General Data Protection Regulation, and the real-name web phenomenon exemplified by Facebook's name policy. It further examines the management and consolidation of identity on social media platforms like Facebook, shedding light on the regulatory frameworks governing personal data, such as the GDPR. The implications of real-name photo tagging and the typical configuration of the GDPR ecosystem are also addressed.