Southwell has made major contributions to our understanding of the roles that social processes play in driving the diffusion and impact of science- and health-related information. Concise and empirically grounded, Social Networks and Popular Understanding of Science and Health cautions against widespread reliance on peer-to-peer sharing strategies to disseminate vital information. In doing so, it challenges all of us-scientists, educators, and policy-makers-to think more critically and creatively about the potential for our communication efforts to increase disparities in access to information that can help people live healthier lives in a healthier world. Science Readers of Social Networks and Popular Understanding of Science and Health: Sharing Disparities are likely to come away better informed and inspired. -- Michelle Shumate Health Communication