Affinity Diagramming

I've been thinking a bunch about the parts of a game and how I still don't think there is a large degree of agreement on what happens when when playing a game on a meta level. And then sicne process engineering is such a big part of my life I was thinking what tool might work the best. And then I settled on Affinity Diagrams as being a good way to start. However it tends to be an everyone in the room sort of activity. I think it could work online just not sure how to techncially do it. Maybe some variant of wiki, but I'm not sure how to do the layout. Something to think about.