Several social media platforms have made targeted efforts to counter the spread of false information about the coronavirus and vaccines against it.

At the same time, vaccine-critical groups on social media have recruited millions of new members during the pandemic.

- You apply to groups of like-minded people to hear what you want to hear, says Åsa Larsson, editor at Källkritikbyrån, which is one of the third-party reviewers who fact-check content on Facebook.

Hear Åsa Larsson tell more in the clip above.