Great looking site. For those who don't know/realize - this is the work of Kevin Systrom, Mike Krieger (and team?) - co-founders of Instagram.
Statistically speaking - love that it has error bars and timeseries. Makes it infinitely more informative to track relative to news, events, and mitigation strategies and have a sense of the confidence of the estimate. The provided Jupyter notebook is a great resource.
Alphabetically speaking - I enjoyed the puzzle of figuring out how the states were sorted in the timeseries list (e.g. why was Alaska before Alabama, Iowa before Idaho, etc.). Turns out it's alphabetical by the two letter state abbreviation which is not shown - just a fun observation :)