relation: http://eprints.imtlucca.it/3020/ title: The spreading of misinformation online creator: Del Vicario, Michela creator: Bessi, Alessandro creator: Zollo, Fabiana creator: Petroni, Fabio creator: Scala, Antonio creator: Caldarelli, Guido creator: Stanley, H. Eugene creator: Quattrociocchi, Walter subject: GT Manners and customs subject: HA Statistics subject: HM Sociology description: The wide availability of user-provided content in online social media facilitates the aggregation of people around common interests, worldviews, and narratives. However, the World Wide Web (WWW) also allows for the rapid dissemination of unsubstantiated rumors and conspiracy theories that often elicit rapid, large, but naive social responses such as the recent case of Jade Helm 15––where a simple military exercise turned out to be perceived as the beginning of a new civil war in the United States. In this work, we address the determinants governing misinformation spreading through a thorough quantitative analysis. In particular, we focus on how Facebook users consume information related to two distinct narratives: scientific and conspiracy news. We find that, although consumers of scientific and conspiracy stories present similar consumption patterns with respect to content, cascade dynamics differ. Selective exposure to content is the primary driver of content diffusion and generates the formation of homogeneous clusters, i.e., “echo chambers.” Indeed, homogeneity appears to be the primary driver for the diffusion of contents and each echo chamber has its own cascade dynamics. Finally, we introduce a data-driven percolation model mimicking rumor spreading and we show that homogeneity and polarization are the main determinants for predicting cascades’ size. publisher: National Academy of Sciences date: 2016 type: Article type: PeerReviewed format: application/pdf language: en rights: cc_by_nc identifier: http://eprints.imtlucca.it/3020/1/PNAS-2016-Del%20Vicario-554-9%20%281%29.pdf identifier: Del Vicario, Michela and Bessi, Alessandro and Zollo, Fabiana and Petroni, Fabio and Scala, Antonio and Caldarelli, Guido and Stanley, H. Eugene and Quattrociocchi, Walter The spreading of misinformation online. Proceedings of the National Academy of Sciences, 113 (3). pp. 554-559. ISSN 1091-6490 (2016) relation: http://www.pnas.org/content/113/3/554.abstract relation: 10.1073/pnas.1517441113