Twitter CEO Jack Dorsey recorded a podcast with a fitness star who recently said that vaccines cause autism

AP Photo/Jose Luis Magana

Twitter CEO Jack Dorsey.

• Twitter CEO Jack Dorsey guested on a podcast with Ben Greenfield, a fitness personality who last month tweeted that vaccines cause autism.
• This a main contention of the "anti-vaxx" movement, which claims that vaccines are harmful.
• The role of social media platforms in spreading anti-vaccination content has been under scrutiny recently due to a spike in measles cases.
• Dorsey praised Greenfield's health knowledge.

Jack Dorsey has appeared as a guest on a podcast with an anti-vaxxer.

The Twitter CEO, who over the past year has been at pains to stress $4 on its platform, recorded a podcast with fitness personality Ben Greenfield.

Greenfield $4 that "vaccines do indeed cause autism," an unfounded theory espoused by the "anti-vaxx" movement. Greenfield also encouraged people to distrust fact-checking website Snopes.

The spread of anti-vaccine messages online has been thrown into sharp relief recently $4. $4 that it will take action by blocking advertisements that contain vaccine misinformation. It also promised to disable the ad accounts of repeat offenders.

YouTube announced last month that it was $4 from running ads, saying it considers such content to be "dangerous or harmful."

Greenfield said in a tweet that his podcast with Dorsey covers, "advanced stress mitigation tactics, extreme time-saving workouts, DIY cold tubs, hormesis, one-meal-a-day & more." $4 saying the pair had a "great conversation."

"Appreciate all you do to simplify the mountain of research focused on increasing one's healthspan! Grateful for you," Dorsey added.

A source familiar with the taping $4 that the topic of vaccinations did not come up. The podcast is due to be released March 23. Twitter was not immediately available for comment.