Lou Charaudeau just joined the team in the framework of the Algopol project. He 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 his PhD in biomathematics (Oct 2013) on epidemiology, where he could study the propagation of influenza in French cities, based on commuter dynamics. He should categorize cities depending on their transmission behavior. Within the DH team at CMB, he will extend this work towards informational epidemiology.