The development of the Islamist-rooted home-grown terrorism in Europe requires an approach to that phenomenon in terms of favourable social and ideological factors. To understand the radicalisation process of young Muslims, descendants of second and/or third-generation immigrants and converts, we consider a series of phases and tools that can be applied to certain individuals identified in recruitment ground environments. From this perspective, we shall analyse the way the Internet and audio-visual mass media are used to indoctrinate not only Muslims in the Islamic states, but especially targets in the European countries, with a focus on the Balkan region.