In the first of two episodes exploring anti-vaccine misinformation online, we hear the story of what happened to Cincinnati-area pediatrician Nicole Baldwin when her pro-vaccine TikTok video made her the target of harassment and intimidation from anti-vaccine activists online. Renee DiResta of the Stanford Internet Observatory explains their tactics and goals.You can see Dr. Baldwin's original TikTok here. Renee DiResta has written about how some anti-vaccine proponents harass, intimidate, and spread misinformation online here. Email the show at shortwave@npr.org.