Comments on digital news stories and on social media play an increasingly important role in public discourse as more citizens communicate through online networks. The reasons for eliminating comments on news stories are plentiful. Off-topic posts and toxic commentary have been shown to undermine legitimate news reporting, yet the proliferation of digital communication technology has revolutionized the setting for democratic participation. The digital exchange of ideas and opinions is now a vital component of the democratic landscape. Marie K. Shanahan's book argues for news organizations...