"A 4-year-old in Colorado died from flu this week. Days before, his mom reached out to Facebook's biggest anti-vaxx group. Members told her not to take the Tamiflu a doctor had prescribed, but give him oils and elderberries and put potatoes in his socks." https://www.nbcnews.com/tech/social-media/facebook-anti-vaxxers-pushed-mom-not-give-her-son-tamiflu-n1131936