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b'With digitization and simultaneous democratization of the global information landscape, plus declining trust in media and health institutions, misinformation is pervasive. Audiences are forming homophilic social networks, reinforcing opportunities for selecting information that conforms to pre-existing beliefs, a phenomenon known as the creation of echo chambers. Echo chambers are not only problematic when misinformation reinforces certain beliefs, but they also make it difficult to disseminate evidence-based information broadly. In order to understand how public health echo chambers manifest themselves online, we used the Media Cloud suite of tools, an open access global archive of 5+ billion sentences from a set of 25,000 online information sources to conduct three mass media case studies on Ebola, Zika, and Vaccination. Our findings show that public health information networks are largely unsuccessful in driving an evidence-based information network narrative around any of our case study topics.\\n\\nBased on these results, we invite participants to take part in a round table discussion, assessing the role that the online media ecosystem plays in creating, spreading, and reinforcing health information and misinformation. We hope to analyze together how communication theory and network science can support innovation and new online communication strategies for public health.\\n\\nFor more about this event, visit:\\nhttps://cyber.harvard.edu/events/digitalhealth/2017/02/GyenesSeymour'