That would be interesting. Might have to add it to the backlog of “cool things to look into implementing”. My main concern is if it would increase the echo-chamberyness of social media.
The main problem I see with echo-chambers today is the culture war type of thing. I think there could be interesting solutions to that: based on the karma "distance", build clusters and adapt network topology so that you can only discover clusters that are at a finite distance. Minimize risks of conflict while letting people explore "fringe" ideas (for them).