Basis of my website/story

I found an article online that gives examples of previous community story projects, some of which are still around and seem to have worked well. I'm not sure how I am going to approach creating the website though, as there are so many variations and styles. Some websites have the authors vote on which segment will be added to existing stories, while others focus on creating an experience where the user can choose what path of the story they want to read. I'm not sure what method I want to settle on. I want to allow people to be creative and to have fun; however, I want to make sure that the additions to the story are well written and consistent with the main idea. I may have multiple stories available at once so people can choose what story they want to be a part of instead of having one singular story. I don't think I will put limits on how long the story can go on, the only thing I should place limits on is how much each person can write.