Authonomy is a writing-focused social network conceived by publishing house HarperCollins. Community members upload their work, review and rate the work of others, and polish their writing for potential publication.
Autonomy was created by HarperCollins as a way to foster a writing community that could feed quality work into their various publishing divisions — it's definitely worth noting that participation at Autonomydoesn't sign over publishing rights to HarperCollins. It's a large community of writers who upload their works, discuss them with other writers, and based on their popularity and positive feedback even end up getting attention of the HarperCollins editors.
In addition to participating in the Authonomy community, you can read writing guides by published authors, tips from HarperCollins editors, publication guides and more in the writing tips section.
If you're looking for a little extra motivation to get writing a community of like minded individuals and a system for active feedback and review might just be the ticket. Authonomy is a free service and requires a basic email registration.