https://www.cnbc.com/2019/04/02/zuckerberg-should-learn-from-the-1982-tylenol-scandal-mcnamee.html

There's a case study that business schools use as an example of how companies can manage a crisis of public trust. It involves Johnson & Johnson, the pharmaceutical giant, and how the company reacted after seven people died from ingesting cyanide-laced Tylenol in 1982.

Facebook COO Sheryl Sandberg probably heard it while she was a student at Harvard back in the 1990s, when it was more fresh on people's minds. Johnson & Johnson, the top maker of Tylenol, had a very tough job in explaining how a mystery killer was able to inject poison into bottles of Tylenol before it ended up on pharmacy shelves.