Entropy-based detection of Twitter echo chambers.

Echo chambers, i.e. clusters of users exposed to news and opinions in line with their previous beliefs, were observed in many online debates on social platforms.

Bow-tie structures of twitter discursive communities.

Bow-tie structures were introduced to describe the World Wide Web (WWW): in the direct network in which the nodes are the websites and the edges are the hyperlinks connecting them, the greatest number of nodes takes part to a bow-tie, i.e. a Weakly Connected Component (WCC) composed of 3 main sectors: IN, OUT and SCC.

Correction to: Flow of online misinformation during the peak of the COVID-19 pandemic in Italy.

[This corrects the article DOI: 10.1140/s13688-021-00289-4.].

Flow of online misinformation during the peak of the COVID-19 pandemic in Italy.

Unlabelled: The COVID-19 pandemic has impacted on every human activity and, because of the urgency of finding the proper responses to such an unprecedented emergency, it generated a diffused societal debate. The online version of this discussion was not exempted by the presence of misinformation campaigns, but, differently from what already witnessed in other debates, the COVID-19 -intentional or not- flow of false information put at severe risk the public health, possibly reducing the efficacy of government countermeasures. In this manuscript, we study the impact of misinformation in the Italian societal debate on Twitter during the pandemic, focusing on the various discursive communities.