In this conversation with Dr Cassie Rhodes, Luisa Fassi, PhD researcher at the University of Cambridge and winner of the Psychology of Technology Dissertation Award, discusses her work exploring how teens with and without clinical-level mental health conditions engage with social media. Her findings highlight the complexity of online life for young people, particularly those experiencing internalising symptoms such as anxiety and depression. Luisa’s work pushes us to look beyond screen time alone, and instead to consider emotions, behaviours and vulnerabilities and how these might be reflected in young people's digital experiences.