Writing: ESL, ABE/GED Story Squared

http://www.storysquared.com/ Story Squared

"Want to be creative but don't have the time? Start a story on StorySquared and see where it goes. Friends and family contribute to a story thread that you create. The results can be funny, imaginative, or just plain strange. Try it out now and see!
Start your story “Once upon a time…”
Send it to the people you want to contribute.
You and your friends read the story as it unfolds! "

Above is the lead into this site. It's an interesting tech twist on an old writing technique that would be great for imtermediate and higher level ESL students, and would also obviously work on an online environment. There are public stories that you can add to, or create an entirely new story.