Today Microsoft FUSE labs introduced a new social website called Docs.com. It lets you discover, create, and share Microsoft Office documents with your Facebook friends.
It has been built using Microsoft Office 2010 and provides the best possible document service for the Facebook environment. Seamless integration with Facebook means you can share your Office documents with assigning permission to open and edit as per users.
The interface of website is pretty much similar to Office 2010 Desktop version and includes the same ribbon UI. You can create and upload Word document, Excel spreadsheet and PowerPoint presentation online.
It is totally free and you can sign up with your Facebook Credentials. Although the website is still in beta, we may see more changes and features in future.