title: Science vs conspiracy: collective narratives in the age of misinformation.
abstract: The large availability of user provided contents on online social media facilitates people aggregation around shared beliefs, interests, worldviews and narratives. In spite of the enthusiastic rhetoric about the so called collective intelligence unsubstantiated rumors and conspiracy theories-e.g., chemtrails, reptilians or the Illuminati-are pervasive in online social networks (OSN). In this work we study, on a sample of 1.2 million of individuals, how information related to very distinct narratives-i.e. main stream scientific and conspiracy news-are consumed and shape communities on Facebook. Our results show that polarized communities emerge around distinct types of contents and usual consumers of conspiracy news result to be more focused and self-contained on their specific contents. To test potential biases induced by the continued exposure to unsubstantiated rumors on users' content selection, we conclude our analysis measuring how users respond to 4,709 troll information-i.e. parodistic and sarcastic imitation of conspiracy theories. We find that 77.92% of likes and 80.86% of comments are from users usually interacting with conspiracy stories.
authors.affiliation: IUSS Institute for Advanced Study, Pavia, Italy; Laboratory of Computational Social Science, Networks Dept IMT Institute for Advanced Studies Lucca, Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Bessi
authors.affiliation: Laboratory of Computational Social Science, Networks Dept IMT Institute for Advanced Studies Lucca, Italy.
authors.forename: Mauro
authors.initials: M
authors.lastname: Coletto
authors.affiliation: Laboratory of Computational Social Science, Networks Dept IMT Institute for Advanced Studies Lucca, Italy.
authors.forename: George Alexandru
authors.initials: GA
authors.lastname: Davidescu
authors.affiliation: Laboratory of Computational Social Science, Networks Dept IMT Institute for Advanced Studies Lucca, Italy; ISC-CNR Uos "Sapienza", Roma, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Scala
authors.affiliation: Laboratory of Computational Social Science, Networks Dept IMT Institute for Advanced Studies Lucca, Italy; ISC-CNR Uos "Sapienza", Roma, Italy.
authors.forename: Guido
authors.initials: G
authors.lastname: Caldarelli
authors.affiliation: Laboratory of Computational Social Science, Networks Dept IMT Institute for Advanced Studies Lucca, Italy; Laboratory for the Modeling of Biological and Socio-technical Systems, Northeastern University, Boston, USA.
authors.forename: Walter
authors.initials: W
authors.lastname: Quattrociocchi
mesh_terms: D003142:Communication; D006801:Humans; D033262:Narration; D012586:Science; D061108:Social Media; D060756:Social Networking