relation: http://eprints.imtlucca.it/3554/ title: Users Polarization on Facebook and Youtube creator: Bessi, Alessandro creator: Zollo, Fabiana creator: Del Vicario, Michela creator: Puliga, Michelangelo creator: Scala, Antonio creator: Caldarelli, Guido creator: Uzzi, Brian creator: Quattrociocchi, Walter subject: QC Physics description: On social media algorithms for content promotion, accounting for users preferences, might limit the exposure to unsolicited contents. In this work, we study how the same contents (videos) are consumed on different platforms -- i.e. Facebook and YouTube -- over a sample of 12M of users. Our findings show that the same content lead to the formation of echo chambers, irrespective of the online social network and thus of the algorithm for content promotion. Finally, we show that the users' commenting patterns are accurate early predictors for the formation of echo-chambers. publisher: arXiv date: 2016 type: Working Paper type: NonPeerReviewed format: application/pdf language: en rights: cc_by_nc identifier: http://eprints.imtlucca.it/3554/1/1604.02705v1.pdf identifier: Bessi, Alessandro and Zollo, Fabiana and Del Vicario, Michela and Puliga, Michelangelo and Scala, Antonio and Caldarelli, Guido and Uzzi, Brian and Quattrociocchi, Walter Users Polarization on Facebook and Youtube. Working Paper arXiv (Submitted) relation: https://arxiv.org/abs/1604.02705 relation: arXiv:1604.02705