I hope this question is suitable for discussing here.
I've been hanging around on PSE, I found the text editor of this site is very good and simple(Markdown+Mathjax). I hope to find an online editor just as PSE, with a preview pane, the syntax is same, support math equations.
I also want that I can save the manuscript on the server and get the sharing links so that I can send it to anyone.
In summary, what I wanted is writing a post on PSE however this post would not bother anyone unless I share the link with them. Because some question may be too specific and no need to be seen to all the people, or maybe sometimes I want to discuss a questions with my friends privately.
I wonder if PSE can offer this feature or anyone know a free online website fits all my requirements?