a system of tags and volume knobs.

should be able to tag people ( ex tag: nazi ) as well as individual notes ( ex tags: bitcoin, spam )

should be able to volume control tags ( deboost bitcoin 4X, deboost spam 10X )

and volume control people both directly ( deboost Dissident Sound 4X ) and via tags ( deboost Nazis 4X )

you should be able to tag both yourself / your own content and others and their content 

finally should be able to select whether to deboost content by pushing it down the timeline or by having it appear less frequently - which is not the same.  or a combination of the two.