Public Speaking is different from Speaking in Public. Public Speaking is backed by skills in speaking to an audience, not necessarily a mass audience. Public Speaking need not be Mass Communication. I remember when I was a student of University of London Institute of Education, my professor Ms. Helen Coppen in her first lecture on Public Speaking had said that when you speak to an audience, you will have to make an assumption, which is wrong, and that is: The people sitting before me are all fools without having any knowledge of the subject.
I have practised the advice and have always become successful. I have never developed stage fright. I have trained officers of Army, Police and Members of Rotary and Lions Clubs in Public Speaking. Many of the News Readers of Doordarshan have been my students. They do a different sort of Public Speaking because they do not see their audience.