TY - RPRT A1 - Bessi, Alessandro A1 - Zollo, Fabiana A1 - Del Vicario, Michela A1 - Puliga, Michelangelo A1 - Scala, Antonio A1 - Caldarelli, Guido A1 - Uzzi, Brian A1 - Quattrociocchi, Walter Y1 - 2016/// PB - arXiv EP - 13 VL - arXiv:1604.02705 N2 - 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. UR - https://arxiv.org/abs/1604.02705 TI - Users Polarization on Facebook and Youtube ID - eprints3554 M1 - working_paper AV - public ER -