Language was developed as a necessity, to fill a void, a need, at its most basic as a primal function language allows for communication etc.  From language story was developed.  First, story was told verbally, than written down, than there were television and movies, and even videogames now tell stories.  As a new medium is developed not long after a method of telling story through the particular medium will develop. 
One such new medium is Twitter.  I'm all but certain that you already know, Twitter is an online social networking and microblogging service that enables users to send and read "tweets", which are text messages limited to 140 characters. Registered users can read and post tweets but unregistered users can only read them.  One would imagine that with the limiting factor of only 140 characters would restrict creativity and particularly the ability to tell story through the medium.  In fact, Twitter seems not just more suited for things such as breaking news and personal expression, but only suited for things such as breaking news and personal expression.  However, this is not the case.  Much to my surprise there is such a thing as Twitter fiction which includes but is not necessarily limited to fiction which fit within a 140 character space.
Here is an example of such 140 character fiction:
She asked, “Will she be OK?” He said, “Her brain tumor was the size of a fist. What do you think?” Silence burdened the descending elevator.
Other Twitter fiction authors have told their story using not just one 140 character tweet, but instead multiple 140 character tweets drastically changing the dynamic of the story.  Elliot Holt is one such author.  She told a story of the death of a woman through multiple tweets and multiple characters in the story.  Here's the story.
Story evolves to fit every medium, so what's next for story?
For more information on Twitter fiction and Twitter's evolution etc. check out the video below.