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Radical milieus have been described as specific social environ¬ments whose culture, narratives, and symbols shape both individuals and groups, and the social networks and relationships out of which those individuals and groups develop and emerge. Researcher Peter Waldmann and his co-authors attribute distinct and independent qualities to these environments, portraying them as social entities in their own right, that is, a collective of people sharing certain perspectives and a unitary identity: a “subculture” or a “community.” This does not mean that conflict is absent between any given radical milieu and the violent extremist or terrorist group(s) that emerges from within it. Milieus have their own interests that lead them not just to interact with, but oftentimes to criticise and sometimes even confront their violent offshoots. Perhaps most importantly, Waldmann’s conception of radical milieus appears not merely to have social relationships as a core characteristic, but necessitates, implicitly or explicitly, face-to-face interaction amongst the members of any given milieu.

This article seeks to contribute to broadening the focus of research in the area of violent online political extremism by examining the use of the internet by dissident Irish Republicans and their supporters. The argument here is not that the internet substitutes face-to-face contacts amongst Irish Republicans, including violent dissidents, nor that it currently plays a central role in processes of radicalisation into violent dissident groups, but that it has an important support function in terms of providing an ‘always-on’ space for discussion, consumption, and production of Irish Republicanism and thus a potentially useful educative role in terms of introducing ‘newbies’ to violent dissident Republicanism while also acting as a ‘maintenance’ space for the already committed. This exploratory study considers the importance of these functions in the context of repeated suggestions that the dissidents have no significant support-base or constituency as internet activity certainly gives the appearance of some such support.

The increased online presence of jihadists has raised the possibility of individuals being radicalised via the Internet. To date, the study of violent radicalisation has focused on dedicated jihadist websites and forums. This may not be the ideal starting point for such research, as participants in these venues may be described as “already madeup minds”. Crawling a global social networking platform, such as YouTube, on the other hand, has the potential to unearth content and interaction aimed at radicalisation of those with little or no apparent prior interest in violent jihadism. This research explores whether such an approach is indeed fruitful. We collected a large dataset from a group within YouTube that we identified as potentially having a radicalising agenda. We analysed this data using social network analysis and sentiment analysis tools, examining the topics discussed and what the sentiment polarity (positive or negative) is towards these topics. In particular, we focus on gender differences in this group of users, suggesting most extreme and less tolerant views among female users.