#mastodon could use some better filter options, especially for mods. There's things I never want to see during my normal browsing, but I want to be aware of if it shows up in my #LocalTimeline, to be able to moderate it.
Say, there's some wild politics going on in Absurdistan, and people regularly get very toxic about it - I'd love to have a filter option where I can say "hide anything matching 'absurdistan' on my local timeline behind a warning, and make it disappear completely everywhere else".
The option to apply a #filter to "public timelines" isn't good enough in that use case, because I regularly read the federated timeline, and I'd want it completely filtered.