https://www.vox.com/recode/21527013/covid-19-vaccine-pfizer-safety-social-media-misinformation

Facebook, Twitter, and YouTube are bracing for more misinformation.

On Monday, Pfizer and BioNTech announced in a press release that their vaccine candidate was more than 90 percent effective at preventing Covid-19 infection, based on initial results from their ongoing phase 3 clinical trial. The company expects to have applied for emergency use authorization with the Food and Drug Administration (FDA) by the end of November and could have as many as 50 million doses produced by the end of 2020.