According to Byers, Facebook said: "We will not be distracted by accusations which aren't supported by the facts.
"The fact is that more than 2 billion people have viewed authoritative information about COVID-19 and vaccines on Facebook, which is more than any other place on the internet.
"More than 3.3 million Americans have also used our vaccine finder tool to find out where and how to get a vaccine. The facts show that Facebook is helping save lives. Period," the statement said.