Ah, yeah, I was thinking of making a website for this. I wanted to start with freeforums but I ended up stopping because I didn’t really understand how the forums would work into story creation. However, there is one website which I think can easily serve the purpose and I was planning to make those forums surround it. It is called Neocities and it is a free web hosting site a lot like Geocities, but I think it may have more complex features potentially. It has never been done before, but you could write a branching story in it. But I don’t know how the user can share information. At the moment, I’m thinking maybe they could send emails or something through the site, if that is a thing that can be done. Otherwise, I would use the forums to organize the community content discussions.
Why am I avoiding Twine? It is pretty closed off and it doesn’t normally update for every user like a website would. Twine also has a pretty frustrating navigation system that would be surpassed just by using a web browser’s features instead.