Social media strongly shapes our everyday lives – especially those of young people. At the same time, the debate on how platforms should be designed to promote well-being, particularly mental health, rather than harm it, is growing and becoming more relevant by the day. Yet, while research is increasingly providing insights into the effects of platform design, algorithms, and usage patterns, one key question remains: **How much of this knowledge actually reaches platforms and policymakers? 

In this keynote, I will share insights from the European research project PROMISE and highlight key challenges and tensions between scientific evidence, current platform design, and regulatory approaches in Europe. 

The talk will be followed by an open discussion: 

The session invites participants to reflect on concrete solutions and to bring together diverse perspectives on how to shape better digital environments.