I’m not sure how they do this, but 7 x 20 publishes fiction and poetry on Twitter.
That means there is a 140 character max. You have to include your Twitter handle (part of the 140 characters) and they don’t allow serials. Everything must happen in a single post.
Maybe some poetry would work in this format but I’m not sure how to do a short (as in very, very, very short) story in this format.
But I give them credit for trying.
Their website: http://www.joannemerriam.com/seven-by-twenty/
Their Twitter Account: http://twitter.com/7×20