> Find out why companies like Google, MSN, and Vevo use Angular.

Because they were part of its creation and are invested in it.

> Or why companies like Sony, Reddit, and Pinterest use Backbone.

Pinterest just switched to React.

> Or why companies like Netflix, Yahoo, and LinkedIn use Ember.

Netflix just switched to React.

> There are smart people out there not choosing React. Ask yourself, why not?

Not for long.