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Recent decades have seen a blurring of the line between extremist movements and mainstream politics, driven by rising sectarian polarization. This development has been linked to digital media, with suggestions that so-called echo chambers may drive political radicalization. To understand the social processes taking place inside such digital spaces, this article draws on Randall Collins and the Durkheimian tradition to develop a theory of discursive community formation. Empirically, we analyze 20 years of discussion on the White Power forum Stormfront, employing natural language processing to study discursive evolution as members become socialized into the community. Our findings suggest that digital media provide space for conversational rituals that instill in people a sense of social membership and intersubjectivity, contained in the elaboration of a shared discourse, within which certain beliefs become sacred and unquestionable. This provides a potential social mechanism linking echo chambers to the rise of sectarian polarization.

The rise of ISIS and associated jihadi violence taking place in Syria and Iraq has reverberated widely. The effects can be felt not just in the horrific attacks that took place in Paris in January 2015, but across the Asia-Pacific region as well, including Australia. Public officials and analysts are struggling to understand and devise countermeasures to the recruitment mechanisms employed by ISIS and other violent extremist groups. This essay explores the role that social media has played in ISIS’s efforts to attract adherents.

While the use of the internet and social media as a tool for extremists and terrorists has been well documented, understanding the mechanisms at work has been much more elusive. This paper begins with a grounded theory approach guided by a new theoretical approach to power that utilises both terrorism cases and extremist social media groups to develop an explanatory model of radicalisation. Preliminary hypotheses are developed, explored and refined in order to develop a comprehensive model which is then presented. This model utilises and applies concepts from social theorist Michel Foucault, including the use of discourse and networked power relations in order to normalise and modify thoughts and behaviors. The internet is conceptualised as a type of institution in which this framework of power operates and seeks to recruit and radicalise. Overall, findings suggest that the explanatory model presented is a well suited, yet still incomplete in explaining the process of online radicalisation.

Recent years has seen a trend towards the increasing specificity of recruitment targets for global jihad. This paper is a case study of the discourses used to recruit a Western female who originally subscribed to an antigovernment, anti-New World Order ideology. Categorising using grounded theory analysis found that female recruiters tapped into the interest of their target subject and then shifted her towards sympathy and commitment to radical Islam. This was achieved through media saturation of Western aggression against Muslims coupled with an ideology that promotes the need to fight and resist. Subject material to which the recruit was directed was carefully controlled and initially deemphasized the Qur’an in favour of mujahedeen narratives and the teachings of Anwar al-Awlaki. Overall, the research supported a sophisticated narrowcasting strategy that was carefully developed primarily by female recruiters.

Extremism has grown as a global problem for society in recent years, especially after the apparition of movements such as jihadism. This and other extremist groups have taken advantage of different approaches, such as the use of Social Media, to spread their ideology, promote their acts and recruit followers. The extremist discourse, therefore, is reflected on the language used by these groups. Natural language processing (NLP) provides a way of detecting this type of content, and several authors make use of it to describe and discriminate the discourse held by these groups, with the final objective of detecting and preventing its spread. Following this approach, this survey aims to review the contributions of NLP to the field of extremism research, providing the reader with a comprehensive picture of the state of the art of this research area. The content includes a first conceptualization of the term extremism, the elements that compose an extremist discourse and the differences with other terms. After that, a review description and comparison of the frequently used NLP techniques is presented, including how they were applied, the insights they provided, the most frequently used NLP software tools, descriptive and classification applications, and the availability of datasets and data sources for research. Finally, research questions are approached and answered with highlights from the review, while future trends, challenges and directions derived from these highlights are suggested towards stimulating further research in this exciting research area.