RSS is pub/sub, right? Doesn't social media like Facebook, LinkedIn or Twitter - where you post stuff and other people post stuff - resemble that? Replace 'your' account, profile or page with your own website.
With the right website software it's easy to have an RSS feed nowadays, so the only thing that's missing is website software that also works like an RSS reader. In the most basic sense you only have to read XML with your program.
So now there's your own feed and other people's feed, mixed up in a nice and honest timeline (however you program that). To me this sounds a lot like the first principles behind social media, but without the obscure algorithms to fvck your timeline and without the intruding ads (I have nothing against ads per se).
P.S. Sorry for ranting about the weapons metaphor. I triggered on it and felt the need to tell what I think about language.
Edit: I forgot to say that RSS feeds have been there all the time for a lot of websites based on Wordpress. That has big value, because it means there's no need for technical adoption. These are all websites with feeds up and running right now. I've been hating on Wordpress for other reasons, but this was a good move for the open web from them.