The emergence of online social media has provided a new outlet for individuals to develop greater cohesion when mitigating, preparing for, responding to, and recovering from large-scale disasters. Yet, the promise of social media to address social disparities and mediate population vulnerabilities has been largely unfulfilled. The goal of this ASPR-funded project is to improve the disaster response capabilities of health departments and other agencies by increasing the use of social media data for research and communication.