Re: Shocking Images and Content Warnings...
A personal Reflection :
On the issue of rules regarding content warning and posting in timelines.
We had some disturbing photos posted recently at a Mastodon instance where I am part of the staff and a Moderator. I flagged some of the posts for moderation, and waited to see what the response from other mods and admin would be; it came and wasn't in line with my thinking, exactly.
I had joined a new instance very recently, and as requested by the administrator's welcome message sent to each new user, went to read their Rules page. Liked what I saw; it was well written, in clear terms and organized into different types of possible objectionable posts contents.