we tried to ask amazon about all of this and what, if anything, makes joseph mercola's book different theories and dangerous medical misinformation just like the others that were taken down. first, the e-commerce giant declined our request for an on-camera interview. then, after we sent them a list of questions we'd hoped they'd answer via email, amazon rejected that, too. then, refused to even give us a statement. instead, saying they hope to be more helpful on future stories. amazon's behavior has caught the attention of senator elizabeth warren who, in this letter to amazon's ceo, wrote she is concerned that amazon is peddling misinformation about covid-19 vaccines and treatments through its search and best-seller algorithms. she accuses the retail giant of being unwilling or unable to modify its business practices to prevent the spread of falsehoods. in her letter, she notes that when her own staff searched for terms covid-19 and vaccine, the first result that came up was, you guessed it, joseph mercola's book. and it was tagged as a best-seller. warren goes on to point out to ama

. >> another superspreader of covid misinformation only banned by youtube this week, joseph mercola,ost 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 have lost loved ones? >> reporter: companies like youtube have spent too much time focusing on growth, and not enough on safety says this former-google engineer whow worked with youtube. >> one anti-vax video, for instance, the algorithm designed to recognize similar videos that share the same interest. when -- when i started to work on youtube, i thought i would help

joseph mercola. >> it's an unapproved vaccine.tatement, he was being censored. an attack on his freedom of speech. plus, the conspiracy theorists had little to say when confronted by cnn's randi kaye in august. >> do you feel responsible because of what you've told them about the vaccine? what do you say to families who lost loved ones? >> companies like youtube have spent too much time focusing on growth and not enough on safety, says this former google engineer, who worked with youtube. >> when you start one antivaccine -- when i started to work on youtube, i thought i would -- and get people to learn more information. an algorithm that doesn't take into account, realize that sometimes -- >> and thanks for that report. as cnn heroes marks its 15th anniversary. maria explains how being named a hero in 2018 helped her get food to those who need it most. >> i was 14 when i started building means. i was 23 when we were honored and to get this award and to have our work shown in its full breadth was just so incredible. and it really