/Pol/ used to be more ideologically diverse where you would always see communists libertarians and national socialists duking it out in hilarious exchanges (both sincerely and ironically). But a massive banwave in November 2014 drove a ton of users to 8chan where anyone can create their own board. So now /pol/ is the alt right equivalent of the monoculture seen at Reddit.com/r/politics and 8chan has 10 echo chambers for each political ideology. Echo chambers cement and worsen extremism and the biggest casualty has been the exchange of banter across ideological boundaries.
I think it would work like a tagging feature. So if you make a post, you can put a tags on it like #weapons and #politics anyone subscribed to those tags could see your post and reply to it.
Not sure how to prevent balkanization though, undoubtedly people will post to #politics-antidisestablishmentarianism and whatnot.