There are only two kinds of social apps—media apps and messaging apps.

Messaging apps are about conversations—typically with friends or friends of friends. You don’t need friends for social media.

For each form of expression, there is exactly one social media app that defines that medium. They monopolize and get really big.

The key difference is this...social media apps are about broadcast—share with the world your thought, image, or video.

Messaging apps are used for all kinds of purposes and heavily overlap. They don’t monopolize but can get just as big.