"These Groups and Pages will not be included in recommendations or in predictions when you type into Search", she said in a statement.
We also removed related targeting options, like 'vaccine controversies'.
Leading global health organizations such as the World Health Organization and the US Centers for Disease Control and Prevention have publicly identified verifiable vaccine hoaxes.
Facebook has moved to the forefront of combating anti-vaccination content and vaccine misinformation on its platform by not promoting ads or recommendations. "If these vaccine hoaxes appear on Facebook, we will take action against them".
"Also, ads that include misinformation about vaccinations will be rejected", she said.
And content that contains the misinformation won't be shown on Instagram Explore or hashtag pages.
Facebook also said it would be "exploring" ways to counter false content, whenever users do come across it, with "educational information" about vaccines.
The World Health Organization recently dubbed "vaccine hesitancy" one of the top global threats of 2019, a warning punctuated by one of the worst measles outbreaks in decades, which has sickened at least 75 people across the Pacific Northwest - most of whom are unvaccinated children under 10 years old.
The letter mentioned that above 100,000 children in every round were missed during polio vaccination because of false propaganda regarding the vaccine.
Anti-vaccine views, which have been prevalent for quite some time, are spread by people who believe that either vaccine doesn't work or that they are risky to health, and are vehemently opposed to vaccination and will not tolerate any form of criticism against anti-vaccination. While Facebook has not said exactly what this could look like, the platform now suggests related articles from sources like Snopes on articles that have been proven false.
Some accounts will be disabled if they're found to be continuously violating policy by sharing inaccurate information that could jeopardize the health of the public.
Facebook has a problem with more than just fake news and rumors.