There are many different levels of shadowban apparently. You can be excluded from being able to trend, or gain followers, or to have post visibility at all base

There are many different levels of shadowban apparently. You can be excluded from being able to trend, or gain followers, or to have post visibility at all based on what I've observed. It mainly gets triggered by complaining about Twitter or a favored sponsor... Twitter considers those things censorable, but not upsetting violence and shocking pr0n for some strange reason... ugh.