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Ev Williams It satisfies a basic human need: the need to be heard.
We are social creatures. As much as someone might want to be alone, it is not in our nature. We long to find others like us, our tribe, people who we can related to, and people who will accept us for who we are.
Communicating on the internet is no different than using written language, or telegraphs, or telephones. A new technique of communicating. Regardless of what method people use, people communicate to satisfy their human needs.