When was face to face commnuication invented?

Answer 1

When you think back in your history lessons, you learned that we descend from Cave Men and Women. No one knows when language developed--or even what kind of language that our oldest ancestors used. Most authorities believe language evolved after first using pointing, facial expressions, grunting, etc.

So when you ask when was face to face communication "invented", you have included two errors: 1. language was never 'invented'-- it evolved and 2. we have always had "face to face communication' since our earliest ancestors learned how to control breath and vocal cords to produce sound and began to name things in their world with language.