The advent of social media has revolutionized and empowered communities of people living with rare diseases. Social media has enabled families of children with similar pediatric rheumatic diseases (PRDs) to meet regardless of geographic distance, allowing them to support each other and join together to advocate on behalf of their children. Researchers have also leveraged social media to learn about the health of patients and their communities. In this manuscript, we review the promises and perils of social media related to health, focusing on its potential use to support research and care of children with PRD.