“…Given that the national emergency declaration occurred on March 13, 2020, we collected data from October 1, 2019, to August 31, 2020 (treatment year), including 23 weeks as the pretreatment period and 24 weeks as the post-treatment period, as our treatment group. Further, we obtained data a year ago during the same calendar date, from October 1, 2018, to August 31, 2019 (control year), as the control group following the Miller et al (2021)'s and Sim et al (2022)'s approach. We relied on data between October 1, 2018, to August 31, 2019, to provide a control year that was unaffected by the pandemic but captured the seasonal trend in social media and define "pre" and "post" periods based on a counterfactual treatment date -the same calendar date (month and day) of the national emergency declaration in 2019.…”