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Explore interdependent privacy challenges in digital address books through this 19-minute conference presentation from USENIX Security '25. Examine how personal information stored in online address books creates privacy risks not just for users, but also for the contacts whose data is collected and shared. Learn about comprehensive research findings from two large-scale survey studies involving over 900 participants that reveal the extent of privacy leakage, user awareness levels, and attitudes toward data protection rights. Discover how users interact with their digital address books, their perceptions of associated privacy risks, and their willingness to respect others' data protection rights. Gain insights into the substantial privacy implications of address book data sharing, user comfort levels with granting access to contact information, and the disconnect between privacy awareness and actual concerns. Review concrete design recommendations for creating a more privacy-aware digital address book ecosystem that better protects both users and their contacts from interdependent privacy violations.
