Facebook continues to keep the iPhone application up and running with frequent updates that often add new features or bring user interface changes. The latest version is 3.5 which is available as of now for free in the Apple iTunes App Store.
With the new application version you will be able to tag friends and places in posts, share external links from a web view, as well as enjoy the new design for Profile and Group Walls. The sharing tool has been improved to add privacy controls on posts and match your settings on the web site and there are also a handful of improvements and bug fixes, like speed of Notifications, fixed Chat bugs and so on. Follow the source link to download or check with your computer’s iTunes/device’s AppStore for the update.