I don't get what you mean by shared knowledge. How is Twitter a network of shared knowledge?

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In economics, for example. There are a lot of academics that share their work, opinions, give feedback to others, etc. They even recommend each other. It’s not explicit but is there.

Economics have their own language. You know almost instantly the mental frame or the school of thought through that.

Language seems the natural path to build communities, at least at the beginning