Proceedings of the Twelfth International AAAI Conference on Web and Social Media (ICWSM 2018) The Effect of Extremist Violence on Hateful Speech Online Alexandra Olteanu Carlos Castillo Jeremy Boy Kush R. Varshney IBM Research UPF, Barcelona UN Global Pulse IBM Research
[email protected] [email protected] [email protected] [email protected] Abstract same period, several deadly terror attacks have occured in Western nations (Wang 2017; Global Terrorism Database User-generated content online is shaped by many factors, in- cluding endogenous elements such as platform affordances 2017), leading to an increasingly alarming anti-Muslim and norms, as well as exogenous elements, in particular sig- rhetoric (TellMAMA 2017) by right-wing populist move- nificant events. These impact what users say, how they say ments (Greven 2016) and right-leaning media outlets (Wor- it, and when they say it. In this paper, we focus on quan- ley 2016), often conflating refugees and Muslims with Is- tifying the impact of violent events on various types of hate lamic fanatics (Diene` 2006). This rhetoric has also gained speech, from offensive and derogatory to intimidation and ex- adoption online (UNGP and UNHCR 2017), prompting gov- plicit calls for violence. We anchor this study in a series of ernmental agencies2 and NGOs to call on social media plat- attacks involving Arabs and Muslims as perpetrators or vic- forms to step up their efforts to address the problem of hate tims, occurring in Western countries, that have been covered speech (Roberts 2017; TellMAMA 2017). The concern is extensively by news media. These attacks have fueled intense that the increase in hateful narratives online led to an up- policy debates around immigration in various fora, including online media, which have been marred by racist prejudice and surge in hate crimes targeting Muslim communities (Roberts hateful speech.