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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.

This article analyzes the possible relationship between terrorist groups and the media. As an example, a case study on the Al Qaeda organization will be used. Our methodology will involve analyzing the content of its public statements and examining the developments that have taken place during its history as an organization. Both perspectives suggest that terrorism’s view of the media, far from being composed of rigorous ideological or political principles, is shaped by their calculations of estimated opportunities. Its perception of the mass media, has depended on its perception of estimated media impact. This has determined three stages during its history: 1) Hostility toward media that it has held responsible for hiding or distorting its message; 2) Adaptation to a new environment where there are networks that are willing to interpret reality from a perspective similar to the jihadist point of view 3) Exploitation of the Internet as an indirect means of obtaining the mass media’s attention.

An examination of the organisational nature of the threat posed by jihadi terrorism, supplying quantitative and qualitative data on the dynamics behind the creation, evolution, and disappearance of the main jihadi Internet forums during the period 2008–2012. An analysis of the origins and functions of the forums, their links with terrorist organizations, their internal structures, and the processes accounting for their stability in cyberspace shows that far from representing a horizontal structure where the main actors are a network of followers, the terrorist presence on the Internet is in fact a hierarchical organization in which intervention by formal terrorist organizations plays a crucial role.

This article offers a descriptive analysis of the private interactions which took place on the jihadist Internet forum known as Ansar Al Mujahideen between 2008 and 2010. The analysis of the non-visible part of the forum contributes to a more robust underpinning of some current assumptions regarding the jihadist Internet infrastructure and its hierarchical dependence on, and subordination to, formal terrorist organisations and charismatic leaders. In addition, it offers a new perspective on other aspects such as the many conflicts and rivalries between the different forums, the operational constraints caused by the lack of human and material resources, and the considerable vulnerability of the forums to cyber-sabotage and infiltration attempts.

The present article examines the relevance of jihadist propaganda as an indicator of the threat from terrorism. To that end, it uses jihadist propaganda output referring to Spain as a case study. It proposes an instrument of measurement based on content analysis, in which the origin, format, content, and distribution method of the materials are taken as categories. The results offer empirical evidence regarding the seriousness of the terrorist threat against Spain, a country that is particularly exposed due to its historical and geographical singularities and its status as the victim of an attack deemed paradigmatic in the minds of jihadists.

The present article contends that terrorist activism on the Internet is determined by the technical configuration and ease of use of the tool. Engagement in Internet activities considered criminal offenses is not only explained by a progression in the level of radicalization of the individual. Rather, the type of barriers to entry which they must overcome plays a decisive role in the decision. The article classifies the various Internet spaces featuring terrorist content under the categories of “hard platforms” and “friendly platforms”. This differentiation will enable us to identify how the barriers to entry to such activism have evolved over the last two decades and how this evolution has been responsible for different levels of terrorist mobilization in cyberspace. The investigation focuses on jihadist terrorism and uses the antiterrorist operations carried out in Spain during the period 2001-2020 as a case study.