Fig. 1: Ratio between the number of visitors and number of comments (red line).
From: Measuring the impact of COVID-19 on heritage sites in the UK using social media data

The shaded red area shows the 99% confidence interval. Break points of the line correspond to the closure of the sites during the pandemic due to lockdown, and the spike before the break point in 2020 is likely due to a significant decrease in the number of visitors, rather than a significant increase in the number of comments.