I used that term frequently a long time ago, before the centralizing platforms took over all of technology. I believe it’s time to dig it back out, because for the first time in over a decade, perhaps even two, there’s real uptake in this computing architecture with protocols such as ActivityPub and Matrix.
My definition is at peercomputing.org.
(Historical note: there was a time I called it the “four-point architecture”. My old blog tells me I wrote about it in, gasp, 2005. That means 18 years of walking in the desert, and only now do the doors open up again.)