PC bravery is false bravery that comes from hiding behind a computer screen. It includes saying things online you would never say in person, threatening people you don't like, or making up lies to infuriate people (known as trolling).

In groupthink, our desire for an unified opinion can override our ability to consider other viewpoints objectively.

Whenever you feel swept along in a virtual firestorm, ask yourself if you would deliver your response to this person face-to-face.