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Much qualitative research has drawn an association between social media and domestic terrorism, with the studies reaching different conclusions. However, few empirical studies have evaluated whether the surge in social media participation affects domestic terrorist events. Controlling for common explanations in the literature, we conduct a cross-national, time-series analysis of up to 151 countries from 2000 to 2019 to assess the impact of social media penetration on domestic terrorism. We find that greater social media penetration increases the likelihood of domestic terrorism in countries as it supports extremists’ ability to recruit, mobilize, and train terrorists. Using mediation analysis, we also find that greater social media penetration amplifies online and political polarization, increasing the likelihood of domestic terrorism events. Our work indicates the possible mechanisms linking social media and domestic terrorism and the need to develop and apply appropriate counterterrorism strategies to mitigate terrorist operations.

The paper investigates the potential effects user features have on hate speech classification. A quantitative analysis of Twitter data was conducted to better understand user characteristics, but no correlations were found between hateful text and the characteristics of the users who had posted it. However, experiments with a hate speech classifier based on datasets from three different languages showed that combining certain user features with textual features gave slight improvements of classification performance. While the incorporation of user features resulted in varying impact on performance for the different datasets used, user network-related features provided the most consistent improvements.

From March 8 to June 8, 2018, the Counter Extremism Project (CEP) conducted a study to better understand how ISIS content is being uploaded to YouTube, how long it is staying online, and how many views these videos receive. To accomplish this, CEP conducted a limited search for a small set of just 229 previously-identified ISIS terror-related videos from among the trove of extremist material available on the platform. CEP used two computer programs to locate these ISIS videos: a web crawler to search video titles and descriptions for keywords in videos uploaded to YouTube, and eGLYPH, a robust hashing content-identification system. CEP’s search of a limited set of ISIS terror-related videos found that hundreds of ISIS videos are uploaded to YouTube every month, which in turn garner thousands of views.

This paper takes the case of the Irish Republican Socialist Movement (IRSM) as the point of departure to discuss how insurgent political movement use Web communications. From mirror sites in Ireland and North America, IRSM supporters regularly use Web technology to relay the group message to a global audience at http://www.irsm.org/irsm.html. The resulting direct media contact gives the IRSM unprecedented access to global civil society. By referring to the IRSM Web site, the types of messages transmitted, the forms of transmission (text, video, audio, e-mail or other), and target audiences (national, global, political elites, media), this paper outlines some of the issues and challenges posed by Web-based anti-government media. The Internet and the Web do not constitute a threat to state power as some analysts suggest but at the same time they significantly alter political communication. The IRSM is a case of “enationalism”, that is, the representation of a place as home to a specific group of people. Unlike traditional nationalism, enationalism is not tied to physical space or territory, but to representation of a network of relations based on a common language, historical experience, religion and/or culture. It is about both memory and future projection of a place as the home for a given group. In this light, new media will likely co-exist with other forms of political communication for some time.

Drawing from Life Course Theory (LCT) and General Strain Theory (GST), the current study sought to address the development of negative affect in the online context, specifically whether the turning point of entrance into adulthood was associated with a change in the sentiment expressed online. A mixed-methods approach was employed, whereby 96 individuals were sampled from 3 online Islamic forums, and approximately 3000 posts per user were analyzed over 9 years. Quantitative results display a development in sentiment over time (increasing in negativity) for both minors and adults. Qualitatively, most users displayed a change in overall posting content throughout their time online; but a select few did not display any development – these individuals were the most negative/extreme on the forum. Implications of these findings for research on the role of the Internet in the development of negative narratives and extremism are discussed, as well as avenues for future research.

Without recruitment terrorism can not prevail, survive and develop. Recruitment provides the killers, the suicide bombers, the kidnappers, the executioners, the engineers, the soldiers and the armies of future terrorism. The internet has become a useful instrument for modern terrorists’ recruitment and especially of foreign fighters. Online platforms and particularly the new social media (e.g., Twitter, Facebook, YouTube) combine several advantages for the recruiters. The global reach of the Net allows groups to publicise events to more people; and by increasing the possibilities for interactive communication, new opportunities for assisting groups and individuals are offered, along with more chances for contacting them directly. Terrorist recruiters may use interactive online platforms to roam online communities, looking for more ‘promising’ and receptive individuals, using sophisticated profiling procedures. Online recruitment of foreign fighters by terrorist organisations such as the Islamic State (IS) is analysed here as an example of an online multichannel recruitment venue.