If you make each individual bulletin board receive broadcasts from a central server, then you get the network effects of Facebook and Reddit. Individual boards can just sub to the central server keeping them connected to the hivemind or not. Your community can remain isolated or throttled (only 30% of global updates get through). We do this manually here, where not all global posts get through (you'd be hard pressed to push a Reddit post to the top here). It's the simplest way to federate using existing technology.

This model is already at play. X, Bluesky, Reddit, Truth Social, and Rumble are basically heavily funded private message boards with a large mindshare subscriber base.

Taking our message boards back is proving to be difficult, especially because trying to move the userbase off of it is the same as trying to move people off drugs.