Weaponisation of social media and online information is a real and emerging threat. Hence, this article aims to broaden our understanding of this phenomenon by introducing the concept of mimetic warfare. Borrowing from mimesis, or a particular representation of reality, this article delves into information conflicts as the ones involving a struggle between well-prepared comprehensive narratives that are intended to affect a target population’s cognition and behaviour. Mimesis as a concept is seen as particularly useful in explaining the multiplicity, proliferation and appeal of such representations and interpretations of facts, events or phenomena. The article then presents a case for the Western states’ proactive involvement in mimetic operations at the home front in order to maintain cohesion and not to cede ground to hostile foreign powers.