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In this study, we select the official websites of four known extremist groups and map the networks of hyperlinked websites forming a virtual community around them. The networks are constructed using a custom-built webcrawler (TENE: Terrorism and Extremism Network Extractor) that searches the HTML of a website for all the hyperlinks inserted directing to other websites (Bouchard et al., 2014). Following all of these hyperlinks out of the initial website of interest produces the network of websites forming a community that is more or less cohesive, more or less extensive, and more or less devoted to the same cause (Bouchard and Westlake, 2016; Westlake and Bouchard, 2016). The extent to which the official website of a group contains many hyperlinks towards external websites may be an indicator of a more active community, and it may be indicative of a more active social movement.

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Why would a terrorist choose to utilize the Internet rather than the usual methods of assassination, hostage taking, and guerrilla warfare? Conway (2006) identified five major reasons why extremist groups used the Internet: virtual community building, information provision, recruitment, financing, and risk mitigation. Terrorist and extremist organizations can use the Internet to increase their visibility and provide information about the group along with its goals without posing an increased risk to the members. It also allows them to easily ask for, and accept, donations through anonymous financial services such as Dark Coins. These benefits allow these groups to promote awareness of their cause, to convey their message to, and perhaps foster sympathy from a much larger pool of potential supporters and converts (Weimann 2010). Finally, the Internet also provides asynchronous services with global access, with the sender and recipient located at any place, at any time, without the need to link up at a specific time (Wagner 2005). In short, unlike the real world, cyberspace is borderless without limitation, and this makes identification, verification, and attribution a challenge.

As violent extremists continue to surface in online discussion forums, law enforcement agencies search for new ways of uncovering their digital indicators. Researchers have both described and hypothesized a number of ways to detect online traces of potential extremists, yet this area of inquiry remains in its infancy. This study proposes a new search method that, through the analysis of sentiment, identifies the most radical users within online forums. Although this method is applicable to web-forums of any type, the method was evaluated on four Islamic forums containing approximately 1 million posts of its 26,000 unique users. Several characteristics of each user’s postings were examined, including their posting behavior and the content of their posts. The content was analyzed using Parts-Of-Speech tagging, sentiment analysis, and a novel algorithm called ‘Sentiment-based Identification of Radical Authors’, which accounts for a user’s percentile score for average sentiment score, volume of negative posts, severity of negative posts, and duration of negative posts. The results suggest that there is no simple typology that best describes radical users online; however, the method is flexible enough to evaluate several properties of a user’s online activity that can identify radical users on the forums.

VOX-Pol Blog post.