https://techcrunch.com/2020/04/16/facebook-will-start-alerting-users-who-have-interacted-with-harmful-misinformation-about-covid-19/

Facebook this morning announced its latest step in effort to combat the spread of misinformation around the on-going COVID-19 pandemic. Chief among them is a new message targeting users who have commented on, reacted to or liked false content about the virus.

The social network will pop up a message from the World Health Organization (recently defunded by Trump) with an option to share the link or visit the WHO’s COVID-19 debunk site. “We want to connect people who may have interacted with harmful misinformation about the virus with the truth from authoritative sources in case they see or hear these claims again off of Facebook,” the company wrote in a post.