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ExtremeBB: A Database for Large-Scale Research into Online Hate, Harassment, the Manosphere and Extremism

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Vu, Anh 
Wilson, Lydia 
Chua, Yi Ting 
Shumailov, Ilia 
Anderson, Ross 


We introduce ExtremeBB, a textual database of over 53.5M posts made by 38.5k users on 12 extremist bulletin board forums promoting online hate, harassment, the manosphere and other forms of extremism. It enables large-scale analyses of qualitative and quantitative historical trends going back two decades: measuring hate speech and toxicity; tracing the evolution of different strands of extremist ideology; tracking the relationships between online subcultures, extremist behaviours, and real-world violence; and monitoring extremist communities in near real time. This can shed light not only on the spread of problematic ideologies but also the effectiveness of interventions. ExtremeBB comes with a robust ethical data-sharing regime that allows us to share data with academics worldwide. Since 2020, access has been granted to 49 licensees in 16 research groups from 12 institutions.



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ACL Workshop on Online Abuse and Harms (WOAH'23)

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EPSRC (EP/V026178/1)
European Commission Horizon 2020 (H2020) ERC (949127)
Engineering and Physical Sciences Research Council (EPSRC) [grant number EP/V026178/1] and the European Re- search Council (ERC) under the European Union’s Horizon 2020 research and innovation programme [grant agreement No 949127].