I haven't gotten too far into this article, but I've long thought it would be a good idea if people had their "stuff" on devices they control, then they "subscribe" themselves into networks. You choose what's visible, and every other joiner of that network sees it as part of their "wall" (or whatever other display there might be).

[time passes]

And now that I've read it, yeah, this is getting closer. You could have an app you can write in, centralized in your stuff (Syncthing style, maybe), then everything that's tagged e.g. "work" is made available on what here is a Slack puller, but could be anything.