Facebook is upgrading its mobile website - m.facebook.com - so that it identifies the type of device visiting the site. It means the company will no longer need multiple versions of the site, including touch.facebook.com, and will be able to add extra functionality for compatible devices. The same improvements will also be available on 0.facebook.com.
In a blog post, Facebook designer Lee Byron said the new site is powered by a User Interface framework based on XHP, Javelin and the WURFL database. This enables engineers to write the site in XHP rather than writing separate versions incorporating HTML, CSS and JavaScript.