It's still experimental and not very well tested but I've been adding a new feature to the blocking screen of Freedombone which allows for messages containing certain words or phrases to be blocked. Twitter has this feature and calls it "muted words" and there's a similar capability within the Pleroma interface.

As an example, maybe I don't want to see anything containing the phrase "Black Friday" or "blockchain". There has been so much blockchain hype in the last year that posts on the topic are just another eye-rolling event.

I'm also expecting that as the fediverse becomes more popular that it will also become more adversarial with a greater amount of spammy posts. This type of word based blocking, combined with the existing domain/address blocking might help to mitigate that.