Facebook has been on fire lately—but not in the way it usually is. Its stock is melting and congressional grandstanding (i.e., hearings) about privacy and security begins Tuesday. Facebook is a threat to democracy and society, critics now argue. I’ve lost track of how many professors are demanding the feds regulate or even break up the social-media giant. Don’t they teach classes anymore?

Apple CEO Tim Cook joined the pile-on last month: “I think that this certain situation is so dire and has become so large that probably...