Why do people post news on Facebook? What does a post mean compared to other forms ofexpression? And how does this activity contribute to media appropriation? This research focuses on sharing news, meaning an online interaction which uses information. This activity seems to be the social solution to supporting a person's online exploration. “Who shares what with whom?” is the question asked in this research through multiple approaches, both qualitative and quantitative. The first part is an exploration of online artefacts, counts of what media was shared online, and a few interviews. These diverse points of view show that sharing news enhances public expression of information, but only for some users. Sharing news is a limited part of online media consumption and online interaction. The second part of the research looks in detail at teenagers’ practices on Facebook. For young people on Facebook, all expression has to be social and online artefacts are a way to tell somebody one's position on an issue or on a relationship. News may be there to open interactions. The last part of the research deals with a large dataset of individual Facebook data, available thanks to Algopol Application. Analysis of the diversity of publications shows that the news people share online takes into account their offline media preferences and social activities. Sharing news is an online way of expression based on informations’ reception.