One of the main roles of a leader is to communicate.
Or, perhaps I should say that one of the main roles of a leader is to communicate exceptionally well. Because of the nature of leadership being about setting vision, guiding people to get there, and working through issues along the way, communication becomes a key part of that that process of leadership. Whether a leader primarily communicates in person to her team, by email, video, or even blog posts, the important thing is that a leader communicate well.