Today, it's not a question of whether terrorists will use Artificial Intelligence (AI), but of how and when. Jihadis, for their part, have always been early adopters of emerging technologies: Al-Qaeda leader Osama bin Laden used email to communicate his plans for the 9/11 attacks. American-born Al-Qaeda ideologue Anwar Al-Awlaki used YouTube for outreach, recruiting a generation of followers in the West. Indeed, by 2010, senior Al-Qaeda commanders were conducting highly selective recruitment of "specialist cadres with technology skills" – and, of course, Islamic State's use of Twitter to build its caliphate is well known. Throughout their 20 years of...