The complexity of platform power Information and communication technology has undergone dramatic developments over the last two decades. Increasing interconnectedness has led to more self-organized public debates, platforms and their algorithms have gained new power over discourse, and generative AI has made content fabrication easier than ever. But it has also given research new tools to quantify precisely these systemic changes. Detailed data from social media allows us to measure and model their network structures and dynamics. Against this background, we ask: What is really changing, what does science know about the connection between the crises of democracy and the worldwide use of digital and social media? A better understanding of these systems is critical for civil society in democracies worldwide, and I will conclude with a methodological outlook on how we are currently trying to explore these missing puzzle pieces.