Trolling is not new behavior, but why do people do it? And what effects does it have? Trolls tend to antagonize communities in order to amuse themselves and get attention at the expense of others. Trolling has caused some online publications and news organizations to remove comments from their sites due to the effects the comments had on readers’ perceptions of the content, as well as the costs associated with moderating the comments. In this Lowdown lesson, students will analyze the research presented about why people post mean or negative “trolling” comments, as well as evaluate how trolling has affected online communities and reflect on how it should be addressed.