After the White House called on social media firms to tighten controls on pandemic-related facts shared on their platforms, Facebook Inc removed over three dozen pages spreading misinformation about COVID-19 vaccines.

Companies like YouTube, Twitter and Google have come under fire from the Biden administration for the alarming spread of vaccine misinformation that is hitting the pace of inoculation in a country where many are hostile to being inoculated.

The Center for Countering Digital Hate (CCDH) latest report showed 12 anti-vaccine accounts are spreading nearly two-thirds of anti-vaccine misinformation online.

Facebook disputed the methodology behind the report, but said on Wednesday it removed over three dozen pages, groups and Facebook or Instagram accounts linked to these 12 people for violating its policies.

Some of the main pieces of vaccine misinformation that Biden administration is battling include that the COVID-19 vaccines are ineffective, false claims that they carry microchips and that they hurt women’s fertility, a White House official had said last month.