This document discusses privacy issues related to libraries. It begins by distinguishing between security problems that inadvertently violate privacy and legal uses of information that can still violate privacy. It explores definitions of privacy, why privacy matters for intellectual freedom and concerns over vulnerable individuals. The document examines how freedom to read relates to privacy historically and today. It reviews potential privacy laws and policies, why privacy problems occur, and known privacy issues regarding public records, reidentification, email, commercial privacy violations on the web and examples related to Facebook, ebooks, Amazon and social media buttons.