Microsoft & Facebook announced a social online word processing at Facebook’s developer conference is Docs.com. Docs.com is a way to discover, create, and share Microsoft Office documents with your Facebook friends. The Docs app Built on Microsoft Office 2010, enables Facebook users for the first time to create and share Microsoft Office documents directly with their Facebook friends.
The launch is part of Microsoft’s new FUSE labs “mission”, designed to explore “Future Social Experiences”.
As on the official blog “I’m so excited to announce today the launch of a new beta Facebook app from FUSE Labs called “Docs”, also available at our docs.com website. Built on Microsoft Office 2010, the Docs app enables Facebook users for the first time to create and share Microsoft Office documents directly with their Facebook friends, using the Office tools they already know. The FUSE Labs mission is to explore a range of “Future Social Experiences”. In this exploration it’s our belief that we may increase the value of Office ‘docs’ by giving everyone the ability to seamlessly take their friends and connections with them from Facebook to docs.com.” 
Docs.com and its Facebook app brings together the best of ‘software’ with the best of ‘services’. Documents can be created directly within the app, or can be uploaded from your PC. After starting work on a document alone, you might then choose a few others with whom to share it. 
Docs.com is launched in beta phase and they are gradually allowing people to create and upload their own documents. You may register and Join the wait list and they will notify you when these features become available to you.
More Info: http://www.docs.com/