The murder of Marielle Franco, a councilwoman from Rio de Janeiro, in March 2018 mobilized diverse subjects throughout Brazil, as well as in various parts of the world. Digital social networks played, and still play, a fundamental role of visibility and repercussion of the case in the circulation of data, narratives and emotions. Having as source virtual records on Twitter between the months of March 2018 and March 2019, we propose a reflection on the role played by the digital network in this process. More specifically, how this case was constituted as an event of widespread digital commotion through its virality and contagion in society. The concept of an event of widespread digital commotion was coined throughout this research from the articulation of the renewed monadology of the French sociologist Gabriel Tarde (1843-1904) with reflections on communication and culture in contemporary society (LAZZARATO, 2006; SAMPSON, 2012; HAN, 2018; MARCONDES FILHO, 2010; FRANÇA, ALMEIDA, 2018).  The event made us see what intolerable an epoch has (LAZZARATO, 2006), such as fake news and policies of hatred, widely explored in the digital repercussion of Marielle's death, but it also brings new possibilities of life and transformations of subjectivity.