In a recent conversation on The Joe Rogan Experience, Harvard historian Rebecca Lemov dives into Facebook's contentious 2012 experiment that manipulated users' news feeds to study emotional contagion. The experiment ignited ethical debates and a U.K. investigation due to concerns over privacy and the psychological impact of altering emotional content without users' consent. This incident highlights the delicate balance between tech innovation and ethical responsibility, emphasizing the profound effect digital experiments can have on individuals' mental health.