/r/socialism, among others, although I actually think /r/socialism is one of the ones we're not implementing it on currently, it might be time I had that conversation though. I wouldn't say "run" either. They're all collective efforts of the work of many people. It's not just places I run doing it though, leftist mods have pretty good backchannel communications and relationships, at least amongst the left-unity crowd, there's a bunch doing it that I'm not part of.

Tronald started it, the legend.