This open access book provides researchers and professionals with a foundational understanding of online privacy as well as insight into the sociotechnical privacy issues that are most pertinent to modern information systems covering several modern topics e.g. privacy in social media IoT and underexplored areas e.g. privacy accessibility privacy for vulnerable populations crosscultural privacy. The book is structured in four parts which follow after an introduction to privacy on both a technical and social level Privacy Theory and Methods covers a range of theoretical lenses through which one can view the concept of privacy. The chapters in this part relate to modern privacy phenomena thus emphasizing its relevance to our digital networked lives. Next Domains covers a number of areas in which privacy concerns and implications are particularly salient including among others social media healthcare smart cities wearable IT and trackers. The Audiences section then highlights audiences that have traditionally been ignored when creating privacypreserving experiences people from other nonWestern cultures people with accessibility needs adolescents and people who are underrepresented in terms of their race class gender or sexual identity religion or some combination. Finally the chapters in Moving Forward outline approaches to privacy that move beyond onesizefitsall solutions explore ethical considerations and describe the regulatory landscape that governs privacy through laws and policies. Perhaps even more so than the other chapters in this book these chapters are forwardlooking by using current personalized ethical and legal approaches as a starting point for reconceptualizations of privacy to serve the modern technological landscape. The books primary goal is to inform IT students researchers and professionals about both the fundamentals of online privacy and the issues that are most pertinent to modern information systems. Lecturers or teachers can assign parts of t