 Surveys are a valuable tool for tracking the effectiveness of non-pharmaceutical interventions during a pandemic. In this study, researchers found that self-reported contact rates decreased significantly prior to the implementation of national lockdown measures which was not seen in mobility data. This suggests that surveys may be more effective at tracking the spread of the virus than other methods such as GPS tracking or phone records. Additionally, the researchers found that contact with friends and strangers outperformed contact with colleagues and family members outside the household, suggesting that social distancing measures should focus on these two groups. This article was authored by Andreas Koer, Frederick Jorgensen, Michael Bang-Petersen and others.