Book excerpt: This book is an authoritative discussion of user comments and moderation in digital journalism, examining how user comments have disrupted the field of journalism and how a growing number of news organizations have abandoned commenting features altogether. Making a broad argument concerning user commentary as a manifestation of user engagement and public deliberation, User Comments and Moderation in Digital Journalism: Disruptive Engagement conceptualizes the act of commenting as interactive engagement and participation in a virtual public sphere. The book also explores the organizational policies that have the potential to disrupt – as well as improve – the quality of user discussions. Ultimately, strategies are proposed for managing and improving user comments and encouraging more productive public deliberation in digital journalism. This engaging discussion of a key development in digital journalism is a valuable resource for academics and researchers in the areas of journalism, media and communication studies.