This is only a small part of being a great communicator. If you want evidence, check into the personal lives of some of these people. There are many other ways that we transmit to people. There's body dynamics, emotion, words, innuendo, silence and a host of ways. One of the most effective is with the eyes.
Communication is a series of events that are best described by the shape of a circle.
It is continuous. It is difficult to determine the beginning and the end. We communicate by walking into a room. Some people communicate by the way they drive and arrive at work, home or a party. Some communicate by not showing up.