>> reporter: and taken hold, it has. sherry tenpenny's conspiracy theories have spread far and wide. >> my own doctor tried to get me to get the shot and i told him to go watch dr. tenpenny. >> so you trust this woman on the internet? more than your own doctor some. >> uh-huh. i do. >> another superspreader of covid misinformation only banned by youtube this week, joseph mercola, who had almost half a million followers on the platform. >> it's an unproved vaccine. it's just being accelerated, eliminate virtually every safety study. >> reporter: he still has almost 2 million followers on facebook, and more than 300,000 on twitter. reacting to his youtube ban, he said in a statement he was being censored an attack on his freedom of speech. but the conspiracy theorist had little to say when confronted by cnn's randi kaye in august. >> reporter: do you feel responsible for people who didn't get vaccinated, possibly got sick and died because of what you told them about the vaccine? what do you say to families who