We already know which countries have controlled the spread of COVID-19 better and what “good practices” have enabled them to do so. Eventually, some of these policies could be replicated in other countries. But it is not enough to make a well-informed public intervention. We also need quickly available indicators of how actively populations are responding to the virus threat because current changes in social behaviour could mean significant differences in the spread of the COVID-19 in two weeks (after the incubation period). In this article, Pablo Beytía Reyes and Carlos Cruz Infante explore the potential of Google Trends to quickly track social responses to the pandemic. In all the countries that have reached a downward changepoint in the COVID-19 contagion, an “information saturation peak” preceded it: people were massively searching for information on the subject over 2 to 5 days, and about a week after the peak of searches was reached, a decline in the growth trend of coronavirus confirmed cases could be observed. Does it make sense to associate a Google search boom with a decrease in transmission trends? The authors propose that the frequency of searches is a quick indicator of 1) people’ concerns on the virus, 2) the development of a more informed citizenry on how to avoid transmission and 3) active social response to the virus spread, which generally lead to a downward change in the contagion trend.