Facebook is the most fastest growing social network in the world, with more than 500 Million users, Facebook has become an important part of everyone life. Facebook Application is available on all major operating systems, and now the application is also available in Microsoft Windows Phone 7 Marketplace. The application is beautifully designed, and it’s a good news for users who want a dedicated Facebook app for their WP7 phone. This is not a third party app, because the app is developed by Microsoft. So use the application without any worries.