Before revision:  We identified 13 discussion topics and categorized them into different themes, such as " Measures to slow the spread of COVID-19," " Quarantine and shelter-in-place order in the U.S.," " COVID-19 in New York ," " Virus misinformation and fake news ," " A need for a vaccine to stop the spread ," "Protest against the lockdown," and " Coronavirus new cases and deaths.
After revision:  We identified 13 discussion topics and categorize them into five different themes, such as " Measures to slow the spread of COVID-19," " Quarantine and shelter-in-place order in the U.S.," " COVID-19 in New York ," " Virus misinformation and fake news ," " A need for a vaccine to stop the spread ," "Protest against the lockdown," and " Coronavirus new cases and deaths.