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You can write

whatever

you

want

it says "story" but it means anything that might be going on in your mind, or something you find interesting

thank you for letting me know this.

You can write anything you want. I've seen long stories (to long to read) and simple, "Good night"-posts saying nothing more than Good night.
What you should post depends totally on what you want, and on what your followers want to read.
So, go ahead and write a quick "story" if that is what you want.

okay thanks, now I have a better understanding of this.