I think Chipotle was overvalued before the scandal. It was expanding rapidly and became a fad stock. I think Facebook was fairly valued, and trading at a reasonable PE ratio compared to other large tech companies.

Online privacy is too abstract to cause a visceral reaction of disgust in the average person, but food poisoning scandals can do that, especially to parents or people who recently ate at the restaurant. (Actually, framing the Facebook privacy issue as one involving the endangerment of children would probably get a lot more traction among the general public than the current media narrative.)