With the exponential development of the virtual environment and social networks, radical elements have managed to promote and disseminate their radical ideas, in less time, to a wider and more diversified audience than in the past. This aspect has caused a shift of radicalization processes from the offline environment to the online environment, turning online radicalization into one of the biggest security challenges. This paper aims to (1) provide an insight into the hypothesis according to which the live-streaming of terrorist attacks in recent years could become a new radicalization mechanism, perhaps generating a new trend and (2) identify the elements and dynamics that determine attackers to use live-stream platforms at the time of the terrorist attack. The article proposes an analysis of the current theoretical framework that combines the brief analysis of the main models of online radicalization, highlighting the elements that could underlie a new radicalization model focused on live-stream/copycat terrorist attacks. In this article we aim to answer the following research question: can live-streaming represent a new mechanism of radicalization?