Activities run on digital platforms (II) No 213, 2019/1 - pagesPages 9 to 15IntroductionBy Jean-Samuel Beuscart, Patrice FlichyPages 17 to 47Music recommendation algorithms and listener autonomyBy Jean-Samuel Beuscart, Samuel Coavoux, Sisley Maillard, translated by Liz Carey-LibbrechtPages 49 to 81The economy of musical discovery in the digital ageBy Sophie MaisonneuvePages 83 to 110The shift of uncertainty to the heart of the (re)configuration of a sectorBy Xavier Levoin, Bastien LouessardPages 111 to 137Organizing and exploiting players’ labourBy Mathieu CocqPages 139 to 172The social network sites manager in news outletsBy Nathalie Pignard-Cheynel, Laura AmigoPages 173 to 209Platform workBy Patrice Flichy, translated by Liz Carey-LibbrechtPages 211 to 239The platform state and digital identification of usersBy Marie AlauzenPages 241 to 250Book reviews