Commentator Joe Rogan, whose podcast is the most popular on Spotify, has also used his platform to push unproven Covid-19 treatments. Rogan took down an episode in January after he discussed a fake tweet about Covid-19 vaccines that was falsely attributed to a Florida doctor. – 'Human intelligence' required –Responding to podcast misinformation is challenging because it is a decentralized, primarily audio-based ecosystem on multiple platforms with different moderation rules. NewsGuard, a firm that rates the credibility of websites, announced in May it would begin evaluating the trustworthiness of popular podcasts. Responsibility for countering podcast misinformation is murky, with some pointing to the hosting platforms or recommendation algorithms from tech giants like Apple, Google and Facebook.