My research investigates social behavior in large-scale, online information systems. I study areas where information systems are suboptimal for people — for example, by not meeting people’s needs, goals or expectations — and proposes new computational measures to bridge the gaps. For example, I studied the scale and scope of fake news on social media and develops methods for limiting its spread, audited large-scale algorithmic systems such as Google Search and Gmail to reduce bias and inequality, and examined online user engagement with news in order to promote better measures for engagement