This site provides a easy to use platform to create branching stories. Add a new story thread at the touch of a button and you can even add images from the web. Preview your story as a map, publish online and share with the link with others.
http://ictmagic.wikispaces.com/English
This is an interesting site that feels like a cross between coding and story writing. Make branching stories where readers choose what happens next.
http://ictmagic.wikispaces.com/English