In November 2020, the Procedure against disinformation was approved in Spain and it provoked an intense reaction on social networks and in the media about the repercussions it could trigger on freedom of expression. To analyze this case study and to observe the confluence of the concern of society and journalism about the informative disorders, a combined methodological approach was designed. First, a multi-stage sample of more than 35,000 tweets with the hashtag #Ministeriodelaverdad has been selected, from which a quantitative and qualitative analysis has been carried out. Second, a content analysis was carried out in the main media in Spain, both press and television (ABC, El Mundo, El País, El Confidencial, El Independiente, Eldiario.es, LaSexta, Telecinco y RTVE. We found that the hashtag was promoted by conservative and anonymous political accounts which - with a greater degree of polarization - led the debate and fed the echo chamber with opinions and audiovisual contents. In the media, the editorial bias determines the acceptance of this measure and the plurality. Little similarity is found between the political sources represented in the media, mainly belonging to the bipartisanship (PP y PSOE) and experts from different areas, and the network, where among those identified there is a total predominance of liberals and far-right. This paper allows us to observe the changes in the construction of the public sphere that social media are inducing and, in the matter of the fight against informative disorders, reflects on the importance of the information media leading the shaping of public opinion. [ABSTRACT FROM AUTHOR]