https://www.vox.com/recode/2020/4/16/21223972/facebook-coronavirus-hoaxes-warning-misinformation-avaaz

The company will point users who have interacted with harmful information about the coronavirus to the WHO.

Facebook just announced another step in trying to set the record straight about misleading information about the novel coronavirus on its platform. In the coming weeks, the company will start directing people who have previously “liked,” reacted, or commented on “harmful misinformation” about Covid-19 to information from more authoritative sources, such as a myth-busters website by the World Health Organization (WHO).