But I think there is a lot of agreement on what constitutes shit posting.
Yes there is :)
I think there is agreement on that. If there is agreement, the question is how to make it happen so that people who auto-vote their friends' shitposts switch to voting for quality curated content.
Downvotes, if people use them.
things could go better if more people took interest in witnesses and proposals.
For sure. There is no perfect system, but not much improves through disinterest.
Yeah, if they use them. For shitposts of popular authors? I wouldn't myself unless there is anonymous downvoting. Would you?