There are several venues for micro fiction and prose on Twitter, and if you've somehow found yourself here, you may be interested in some of the others. I recommend reading and following every single one of these. Some of these are paying markets, some are not.
I'm only listing ones that accept other people's work.
Nanoism "Thoughtful" fiction
Outshine optimistic, near-future prose
Thaumatrope Sci-Fi, Fantasy, and Horror
Escarp Poetry and Prose
And of course there's Tweet the Meat, Twitter's premier paying Horrorzine.
I also highly recommend Very Short Story but these are all written by one person.
If anyone knows of any others, feel free to post in comments and I'll add them to the list.