System-level picture - 2 (IMAGE) George Washington University Caption The first system-level picture of nearly 100 million individuals expressing vaccine views among Facebook's 3 billion users across 37 countries, continents and languages. Credit Neil Johnson Usage Restrictions With Permission License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.