The diffusion of Social Media and other systems of social interaction determines, from a labour law point of view, the need for the Jurist to examine the traditional labour legislation institutes, rediscovering limits and interactions that were previously undervalued. Here we find the right to criticise (including trade unions) carried out in the context of technological spaces ("closed" or "open") with respect to which it is necessary, first and foremost, to understand whether - and how relevant - they can assume the nature and the characteristics of the "virtual" space in which the expression occurs. The decay of language in modern systems of interaction poses, then, a reflection (not only social but also legal) about the possible expansi...