WebMD, and the Tragedy of Legible Expertise
6th February 2021
Scott Alexander on a problem of modern life.
WebMD is the Internet’s most important source of medical information. It’s also surprisingly useless. Its most famous problem is that whatever your symptoms, it’ll tell you that you have cancer. But the closer you look, the more problems you notice. Consider drug side effects.
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Drug 1 is aspirin. Drug 2 is warfarin, which causes 40,000 ER visits a year and is widely considered one of the most dangerous drugs in common use. I challenge anyone to figure out, using WebMD’s side effects list alone, that warfarin is more dangerous than aspirin. I think this is because if WebMD said “aspirin is pretty safe and most people don’t need to worry about it”, people might use aspirin irresponsibly, die, and then their ghosts might sue WebMD. Or if WebMD said “warfarin can be dangerous, be careful with this one”, people might refuse to take warfarin because “the Internet said it was dangerous”, die of the stuff warfarin is supposed to treat, and then their ghosts might sue WebMD. WebMD solves this by never giving the tiniest shred of useful information to anybody.