At WordPress.com, we believe short thoughts deserve a real home. Today we’re introducing a new theme built for quick posts, replies, and reblogs: the kind of writing that lives somewhere between a tweet and a blog post, on a site that’s entirely yours.
from: A New Theme for Short-Form Blogging on WordPress.com – WordPress.com News
A new setup on wordpress.com with front end posting, 500 char limit in their editor, but you can go past that if you use an alternative editor, WordLand for example.
It is not clear to me if the features go with the theme, or there is a plugin I can’t see at work. I’ve only got a free WordPress.com account. It looks like you could change the theme.
Of course it would be interesting to see this on self hosted WordPress sites. I did experiment with a telex block that gave simple short form posting. Not quite in a popup, but could be useful on mobile.
Update: Manton has some thoughts: Manton Reece – WordPress short-form interface.