Information diets are more diverse in attention than in engagement

What political content do we pay attention to online? Diverse political information is essential for democratic competence, yet online media raises concerns about fragmented information diets. Research on selective exposure highlights how social media can foster ideological echo chambers, while other studies emphasize incidental exposure to diverse viewpoints. A critical limitation is measurement: existing research primarily uses engagement metrics (e.g., likes or shares), neglecting passive exposure or attention—what users notice but do not interact with. In this study, we address this gap through an experimental platform that separately records attention and engagement. Our findings indicate that the ideology-engagement association is about seven times the magnitude of the ideology-attention association. This underscores the importance of measuring attention, rather than solely engagement, to accurately assess the diversity of online information diets.