The digital information environment means that users engage with content and services in ways that the assessment community is still trying to identify and understand. New and nuanced metrics can help tell a deeper story of impact for libraries. In this session, we will examine the complex issue of data privacy and ethics in the context of library assessment, with case studies drawn from altmetrics, learning analytics, community-based assessment, ebooks, and OER. Questions that will frame our discussion include: What privacy concerns does following user data in that context raise for those responsible for assessment? What are the logistics of gathering that data? What are we collecting, and for what purpose?