Whether in biblical times, during the Middle Ages, or in the twenty-first century, terrorist strikes were then and are now first of all communicative acts intended to get attention in particular communities, countries, regions or even around the globe. The more people witness terrorist violence or learn of horrific attacks from news reports, the more successful are the perpetrators of political violence in furthering the universal goal of terrorists throughout history: achieving the greatest amount of publicity. The one trait that all non-state terrorist groups and lone wolves have shared throughout the history of terrorism has been their quest for attention and spreading fear among their enemies, the recognition of their grievances and demands, and the sympathies of those in whose name they claimed to act. In that respect nothing changed in the maxim that terrorism is ‘propaganda by deed’. Once communication technology was invented, from the printing press, radio, television to the Internet and particular social media platforms, all terrorists have striven for and many have found alternative media to disseminate their own propaganda in written and spoken words, visuals and even motion pictures. Yet, even in the age of mass self-communication, made possible by social media, the traditional media have remained central in the propaganda calculus of all terrorists, in that old and new communication modes have complemented each other.