My thinking with face to face communications not scaling well is that at a certain point, the group becomes so large that communication becomes a 1 way interaction instead of a personal 2 way communication. With just a handful of people, each participant can continue to read the body language of everyone else and participate in the conversation.
On the other hand, when a single person is addressing a large group, it becomes a man talking to an audience, but the audience cannot participate in the conversation the way they could in a 1 on 1 situation. This starts to erode many of the advantages of talking face to face until you reach a point where a man on stage addressing a large crowd may as well be a video recording.
This is still more effective than a text message, but it is an entirely different animal than a discussion between a pair of people.
On the other hand, when a single person is addressing a large group, it becomes a man talking to an audience, but the audience cannot participate in the conversation the way they could in a 1 on 1 situation. This starts to erode many of the advantages of talking face to face until you reach a point where a man on stage addressing a large crowd may as well be a video recording.
This is still more effective than a text message, but it is an entirely different animal than a discussion between a pair of people.
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