This Second Edition presents research, theory, and practical applications for social media and libraries, providing insights into the life of the social library.  Readers are introduced to the features of social sites that can be leveraged to create a unique and diversified library social media presence. The author explains how social media sites and services can be assessed based on a variety of attributes, such as visibility, voice, interaction, reach, impact, and reputation. This new edition addresses the changes in the social media landscape since the first edition was published as well as new issues that impact how libraries use social media. The author also addresses new issues that are impacting how libraries use social media, including changing algorithms, artificial intelligence, misinformation, privacy, moderation, policy issues, and more.