The World Health Organization (WHO) says the world's not only fighting the pandemic, but also what it calls an "infodemic" - where an overload of information, some of it false, makes it difficult for people to make decisions about their health.
And it's trying to answer people's concerns about the vaccines - as well as helping people evaluate the information they see on social media.
Nina, who is 21 and lives in London with her 82-year-old grandmother, is one of those who has concerns,
She says she has "mixed feelings" about Covid vaccines.
