Bubble [1] is a new kind of VPN that does just about exactly what you are looking for. On FB, Twitter, LinkedIn, Insta, etc, you can scroll through your feed and:
* No ads!
* No tracking! (except what you click, can't avoid this)
* Auto-block posts matching keywords you don't like (politics/etc)
* Auto-block posts that contain links to news websites (I use this on FB, it's great)
* Block specific users whether you're connected to them or not.
* Blocked users don't know you've blocked them, because the block is at the network-level, not in the social media service.
Bubble is open source [2], our commercial offering is currently in beta.
How does it work? It's basically a WireGuard VPN with a tightly-integrated mitmproxy. So it works on any device, but the social media blocking only works on the web (native apps are cert pinned, which breaks mitm). AMA.
Oh did I mention it works on HN too? I rarely need to block a user here, but when I do, it sure is nice to have that feature!