If someone posts a death threat or a violent manifesto online, will they cross over from words to deeds? Explicit threats, intimidation campaigns, and incitements to violence are no rarity among white nationalists, incels, and other racist and misogynist extremists. Yet it is often difficult to determine whether they pose genuine risks, since the boundaries between trolling and true violent intent can be blurry. How can we tell the difference between online bluster and terrorist threats?

The early twenty-first century has been defined by a rise in Islamist radicalisation and a concurrent rise in far right extremism. This book explores the interaction between the 'new' far right and Islamist extremists and considers the consequences for the global terror threat. Julia Ebner argues that far right and Islamist extremist narratives - 'The West is at war with Islam' and 'Muslims are at war with the West' - complement each other perfectly, making the two extremes rhetorical alli...