Dear AoIRists, We invite academic researchers, industry practitioners, and social activists interested in online harassment, hate speech, and other forms of online misbehavior to a one-day workshop at CHI 2018: *Understanding "Bad Actors" OnlineSaturday, April 21 in Montr**é**al, Canada* *Apply by February 2: understandingbadactors.org <http://understandingbadactors.org/>* Social media platforms typically seek to diminish bad behavior by restricting perpetrators’ access, imposing strong penalties, or outright disabling accounts. But who are “bad actors?” Do they understand community standards, or even which policies their actions have violated? How do they participate in other social media sites and online communities? What values and experiences shape their interactions online? By listening to the experiences and needs of policy violators, we can 1) identify the roadblocks that prevent “bad actors” from complying with community standards; 2) help them discover more appropriate ways of connecting with others online; and 3) design more effective interventions to reduce the impact of these behaviors on other users. We are hosting a one-day workshop at CHI 2018 focused on understanding the experiences, perspectives, and motivations of people who engage in bad behavior online—including harassment, hate speech, and spam—to generate research and design strategies for prevention, punishment, and remediation. We invite submissions from academic researchers, industry practitioners, and social activists interested in any of the following themes: - Social behavior - Cross-cultural contexts - Policy and enforcement - Punishments and sanctions - Designing social media - Intersectional practice Cheers, Lindsay Blackwell, University of Michigan Mark Handel, Facebook Sarah T. Roberts, UCLA Amy Bruckman, Georgia Tech Lindsay Blackwell <http://www.lindsayblackwell.net> PhD Candidate, School of Information University of Michigan