Ségolène Charaudeau just joined the team in the framework of the Algopol project. She currently works on the definition of political communities within Twitter users, relying in particular on press and media links they exchange. This research builds upon her PhD in biomathematics (Oct 2013) on epidemiology, where she could study the propagation of influenza in French cities, based on commuter dynamics. She should categorize cities depending on their transmission behavior. Within the DH team at CMB, she will extend this work towards informational epidemiology.