The need to spread information comes with the decentralization of authority. A lot gets decided in a lot of places! How information can be spread in the best way highly depends on the culture and nature of the organization. Information flow happens (1) between circles through linking (2) through open meeting minutes and documents within the organization (3) between circles and the general membership (4) between any groups or individuals that desire it.
Tools can be synchronous (video or in person, live online tools) or asynchronous tools (online like email, slack, loomio; physical like a paper binder with documents or posters in a meeting room).