Online collaborative writing website?

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Several months ago I found a website and now I've lost its address. I
tried Google but perhaps I am searching for the wrong keywords. Can
someone help me find it?

The website offered online writing and collaboration tools for authors
(like collaborative fiction). It was a place where you can publish
stories and have other people participate in the writing process. It
was specifically designed for this purpose (i.e. not a forum/bulletin
board thing). I can't find it with a search engine, perhaps I don't use
the appropriate terms. It was somewhat similar to but
with collaboration features and advanced writing functions (like plot
ideas, characters definition, etc.)

Can someone help me in this?

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