Terrorist Use of the Internet by the Numbers: Quantifying Behaviors, Patterns, and Processes

Public interest and policy debates surrounding the role of the Internet in terrorist activities is increasing. Criminology has said very little on the matter. By using a unique data set of 223 convicted United Kingdom–based terrorists, this article focuses on how they used the Internet in the commission of their crimes. As most samples of terrorist offenders vary in terms of capabilities (lone-actor vs. group offenders) and criminal sophistication (improvised explosive devices vs. stabbings), we tested whether the affordances they sought from the Internet significantly differed. The results suggest that extreme-right-wing individuals, those who planned an attack (as opposed to merely providing material support), conducted a lethal attack, committed an improvised explosive device (IED) attack, committed an armed assault, acted within a cell, attempted to recruit others, and engaged in non-virtual network activities and non-virtual place interactions were significantly more likely to learn online compared with those who did not engage in these behaviours. Those undertaking unarmed assaults were significantly less likely to display online learning. The results also suggested that extreme-right-wing individuals who perpetrated an IED attack, associated with a wider network, attempted to recruit others, and engaged in non-virtual network activities and non-virtual place interactions were significantly more likely to communicate online with co-ideologues.

This article is a revised and updated version of the 2015 VOX-Pol report ‘What are the Roles of the Internet In Terrorism? Measuring Online Behaviors of Convicted UK Terrorists.’