What do these 2 tweets have in common?

I recently came across two tweets that caught my eye. Here is the first one from the CDC director:

Rochelle Walensky, MD, MPH @CDCDirector

Masks can help reduce your chance of #COVID19 infection by more than 80%. Masks also help protect from other illnesses like common cold and flu. Wearing a mask- along w/ getting vaccinated- are important steps to stay healthy. #WeCanDoThis @HHSGov vaccines.gov

November 5th 2021

194 Retweets515 Likes

And here is the second one, from a couple months back:

AP Fact Check @APFactCheck

Posts continue to circulate online falsely claiming that COVID-19 survivors don’t need vaccines because of natural immunity. In fact, that protection is variable and not long-lasting, so vaccines are still recommended. Here’s our recent look at this claim. COVID-19 vaccines offer benefits even to those previously infectedCLAIM: Those who have had COVID-19 have natural immunity against the disease and do not need a vaccine. No one should be vaccinated without first testing for COVID-19 antibodies.apne.ws

September 29th 2021

793 Retweets1,107 Likes

Together they got me thinking. What do they have in common? What do they tell us about the state of the public communication of science?