NoteHub is a free and anonymous hosting for markdown pages. It can be used for publishing of markdown-formatted text. For instance, this service might be interesting to people, who want to publish something, but don't want to start a blog.
His changes will be auto-saved every minute, manualy or at a registered page exit. When the same link will be opened again and the page wasn't published yet, the author will be recognized using cookies, or he should enter three non-trivial words from the document, to unlock the draft. The security aspect here is non-critical, since every page will eventually be published on NoteHub anyway. So there is no reason to assume, that a draft contains critical information.