The actual viewing and editing interface will feel familiar to anyone who's used Microsoft's Office products (which, in this day and age, is pretty much everyone): You have a menu bar filled with formatting options at the top of your document, along with standard menus such as "File," "Insert," and "View." Spreadsheets allow you to resize columns and perform most basic functions.

One plus of the program not present in other Web-based collaboration tools: Docs for Facebook allows you to move any document into your own desktop-based Office software for viewing or editing; there's just a single button you click to make the transition. The desktop viewing and editing functions are compatible with both PC and Mac versions of Office; you do, however, need Office 2007 or a more recent version in order for them to work.

The sign-in and editing process is all fine and dandy, but Docs for Facebook's biggest selling point, obviously, is its social component. Upon creating or uploading a new document, Docs for Facebook gives you the option to share the file with any number of friends on Facebook. You can specify individual people as approved readers or editors, or you can opt to make the document public -- to all of your friends, or to the entire Internet -- and have it posted on your Facebook Wall as well.

When it comes to the sharing, the appearance of Docs doesn't look terribly different from what you're used to seeing: A shared document appears on your Facebook Wall and News Feed the same way a shared photo or status update would, except it says "via Docs" at the bottom. Anyone can click it to view it, and anyone can "like" it or comment on it, too.