5 Click on the bottom L corner reply arrow if your post requires added characters.

Chain replies one after another as needed.

I recently learned about other uses of the @ visibility setting.

If no others are mentioned, the post should appear only under your #profile and be shaded to indicate its still private and invisible to any others until you choose to revise it for repost or deletion.

You can therefore use them as temporary notes for a #prepost and there does not appear to be any limit to its use so you can add several invisible replies to your pinned posts

The #Fediverse is a working version of the #GroupMind that Mike #Hodel's #Hour25 use to create Friday nights on LA AM radio before Harlan #Ellison inherited the reins in late 80s. Are recordings available anywhere online?

The use of clever hashtags should allow selection of a subset of related posts in your profile's post chronology or even a particular one once the app can simultaneously search for multiple #hashtags