Platform Governance with Algorithm-Based Content Moderation: An Empirical Study on Reddit

Pratice- and Policy-oriented Abstract Volunteer (human) moderators have been the essential workforce for content moderation to combat growing inappropriate online content. Because volunteer-based content moderation faces challenges in achieving scalable, desirable, and sustainable moderation, many online platforms have started to adopt algorithm-based content moderation tools (bots). However, it is unclear how volunteer moderators react to the bot adoption in terms of their community-policing and -nurturing efforts. Our research collected public moderation records by bots and volunteer moderators from Reddit. Our analysis suggests that bots can augment volunteer moderators. Augmentation results in volunteers shifting their efforts from simple policing work to a broader set of moderations, including policing over subjective rule violations and satisfying the increased needs for community-nurturing activities following the policing actions. This paper has implications for online platform managers looking to scale online activities and explains how volunteers can achieve more effective and sustainable content moderation with the assistance of bots.