We'll have to get our own Ann Hull working on this one. She's been doing well at twitter stories recently, and winning prizes even.
If you think you can write a good one within Twitter constraints, here's a story challenge for you - TwitterFiction Festival 2014. Submit your story before 5th February, and the chosen entries will be be Featured Storytellers on Twitter along with other invited authors of the festival. Or, submit your stories to #twitterfiction where all can participate. See full details here The festival runs 12-16th March 2014.