Social media have become invaluable spaces where we share ideas and debate important societal issues. But our current social media platforms make such productive conversations difficult by amplifying conflict and driving polarization. How can we redesign social media to help foster more productive political conversations? With the recent emergence of AI chatbots like ChatGPT, we finally have a way of answering this crucial question. This project creates synthetic social media platforms with thousands of interacting chatbots, allowing researchers to experimentally test how different platforms shape political discourse. This will help us design social media with more positive societal outcomes.