In the physical public forums where democracy began (the Athenian Agora, etc.), the "public conversation" was face-to-face, meaning anyone capable of hearing it was also capable of speaking into it. This meant that each citizen's engagement with the public conversation was "bidirectional" - they were constantly being informed by the thoughts of others, while inserting their own thoughts where they please. They are both speaking and being spoken to on an ongoing basis.
What's a better word than "bidirectional" to describe what I'm trying to describe here?