“Institute for Disease Modeling chair of applied math and senior research manager Daniel Klein wrote in the Newsroom post, ‘Covid-19 has inherent delays that challenge the pace at which we seek to evaluate policy impact toward a measured response. Mobility data from Facebook’s Data for Good program provides a near-real-time view of important correlates of disease transmission. This data, in combination with other sources, allows us to make better models to inform public health decisions.’”