Somewhat related : Wrote a chrome extension [1] to reduce some noise on twitter. It should be easy to add the ability to filter out tweets by keyword (I'll do it probably this weekend if it is useful).
For some reason, the screenshot on the socialmuter.com home page doesn't load in Firefox or Edge.
I'd love for Twitter to support shared keyword filters and block lists, rather than the current, web-only, politically driven, content-and-code-combined, filters that exist at present.
And Facebook!
I feel both of you! Feel free to fork it and make it work for whatever site you want. The code base is pretty straightforward. You'd just need to change the DOM logic (which is about 2 loc) so it should be pretty doable.
Or an extension that understands how to parse many different news sites and can filter out stories on all of them. Add one keyword (pick your own example ;) and see no headlines containing that keyword on any news site. It wouldn't be that hard, though it would reinforce one's own news bubble.
I actually thought about something similar last night. Have a project that had a plugable DOM parser so people could build plug ins for various sites.