The leading social network has been highlighting health advice from reliable agencies and removing COVID-19 misinformation for months and on Monday expanded that initiative.
A list of debunked claims about the virus or vaccines that are not welcomed at Facebook was updated with the help of the World Health Organisation.
The list of barred misinformation included claims COVID-19 was created by people or that it is safer to get the virus than the vaccine.
It also included false claims that vaccines are toxic or cause autism.
Critics of the social media giant's handling of misinformation were not convinced by its latest move.
"Facebook has been promising to crack down on COVID and anti-vax misinformation for the past year," the nonprofit Centre for Countering Digital Hate said in a message fired off on Twitter.
"Every time, it fails to meet these headline announcements with action."
Groups or accounts that share vaccine misinformation may be removed completely from the social network, warned Facebook vice president of integrity Guy Rosen.
Facebook prominently hosts a COVID-19 information centre, and makes a priority of featuring reliable sources in results for queries on the topic.
People in charge of groups at the social network were told to require posts of members prone to spreading bogus information about vaccines or the pandemic to be approved before being shared.
At Facebook-owned Instagram, accounts of people discouraging vaccinations will be harder to find using automated search tools, according to the social network.
Facebook said that it has gotten more than 50 million responses to a COVID-19 survey it launched last year in a collaboration with two US universities.
It was designed to gather insights from people about COVID-19 symptoms, mask wearing, and access to care.
"The survey program is one of the largest ever conducted and has helped health researchers better monitor and forecast the spread of COVID-19," Facebook said.
"The survey data will provide a better understanding of trends in vaccine intent across sociodemographics, race, geography and more."
Survey findings about vaccine attitudes will be shared globally, according to the social network.
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In December, Facebook announced it would remove false claims about COVID-19 vaccines that had been debunked by public health experts, though in recent weeks news reports have identified Facebook pages, groups and Instagram accounts still spreading these false claims.
Facebook also said it would help users find out where and when they can receive the coronavirus vaccine.
It will partner with Johns Hopkins and the AARP to reach Black, Latinx, Native Americans and people over 50 with educational content that addresses concerns those groups may have about the new vaccine.
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