I have some lists [1] I use to hide YouTube's constant recommendations of things I've already watched. They also hide previously watched music videos, which may be a downside.

1. https://caleb-vincent.io/post/2025-10-01_youtube-filters/#ju...

I'm also looking for a blocklist for X/Twitter that can remove the "who to follow", News sections, etc.

Not a blocklist, but for anyone who wants this, Control Panel for Twitter [1] can hide most things you'd want to hide on Twitter. The latest version adds a way to keep using the Dim dark mode variant theme they recently removed.

[1] https://soitis.dev/control-panel-for-twitter

This is great, thanks