From the Editorially blog:
"It’s with all this in mind that we came together to make Editorially, a new collaborative writing and editing platform. We believe that the web is not merely another distribution pipeline, but a unique and deserving space for both reading and writing. Our goal is to support and encourage that writing process — from the first flash of inspiration all the way through to publication, and at every point in between.
"Editorially achieves this goal in many ways: a Markdown-based writing environment lets you focus on the words and create clean markup easily; collaboration tools let you invite friends and trusted colleagues to review or edit your work; a document version system lets you mark points in a document’s history and compare versions to see what changed; notes and activity feeds encourage you to reflect on your work, for yourself and for others; and discussion threads recognize that the conversation around a text is just as important as the text itself.
"And we’re only getting started. This is not just another text editor: it’s an ecosystem for the writing process. We’ve designed a space that brings you closer to both the words and the people — the only things that matter."