This Article contributes to the ongoing conversation about privacy on social network sites. Adopting Facebook as its primary example, it reviews behavioral data and case studies of privacy problems in an attempt to understand user experiences. The Article fills a crucial gap in the literature by conducting the first extensive analysis of the informational and decisional environment of Facebook. Privacy and the environment are inextricably linked: the practice of the former depends upon the dynamics and heuristics of the latter.The Article argues that there is an environmental element to the Facebook privacy problem. Data flow differently on Facebook than in the physical world, and the architectural heuristics of privacy are absent or misleading. This counterintuitive informational environment waylays privacy practices, opens a gulf between expectation and outcome, causes a crisis in self-presentation, and facilitates what Professor Helen Nissenbaum calls a loss of contextual integrity.The Article explores possible interventions. It explains how regulatory solutions and market forces are themselves hindered by the the deficient privacy environment of Facebook and cant solve all of its problems. This Article recommends renovating the design of Facebook to privilege privacy practices and proposes specific interventions drawn from the computer science and behavioral economics literature. It concludes with a message of cautious optimism for the emerging coalition of engineers, academics, and practitioners who care about privacy on networked publics.
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