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Post length and character limit: how long is too long?
The post length limit on Infosec.Exchange is 11,000 characters. The standard Mastodon post limit is 500 characters, which is still longer than Twitter at 280, but shorter than Facebook at 33,000.
With an 11,000 character limit, you could share the whole of the Project Gutenberg translation of War and Peace in a little over 300 posts, but don't.
Don't force people to scroll past your wall of text
It's fine to write longer posts, but if they're longer than a few hundred characters, put them behind a Content Warning so people don't have to scroll past your giant wall of text. Repeated or egregious use of too-long posts is may collide with Rule #5.
Some other instances may not support long posts
what happens if a user on Infosec.Exchange posts a long post and someone on a vanilla Mastodon tries/wants to read it - does it work, or does the vanilla instance trim or reject the long post?