“CLEMI guests” come back with a series of webinars dedicated to disinformation. These webinars offer an in-depth exploration of a topic through the combined perspectives of three experts. A media professional provides their on-the-ground insights, an academic offers a broader, more academic viewpoint, and teachers offer practical advice for classroom implementation. This comprehensive approach provides you with key insights and material for your teaching projects. To open this cycle, CLEMI welcomes Arnaud Mercier, professor of information and communication sciences at Panthéon-Assas University, to address the issue of information warfare, amplified by social networks and artificial intelligence.