The Facebook iPhone app [iTunes link] just got better. Facebook for iPhone 3.1 went live in the iTunes application directory yesterday. The new version includes two new features:  1) Address Book Syncing & 2) Push Notifications.

Push Notifications

As soon as you update the app to version 3.1, you’ll be asked for permission to receive notifications. You can receive push notifications for messages, wall posts, friend requests, friend confirmations, photo tags, events, and comments. You’ll probably want to customize these notifications so that you do not get overwhelmed with constant updates. And, as I discovered, all notifications are on by default. You can modify them by going to “Settings” on the iPhone and scrolling down to the Facebook app.

Address Book Syncing

After you allow or deny push notifications, you’ll be asked if you want to sync Facebook with your address book. If you enable this feature, it will sync your current contacts with Facebook and pull in names, photos, and other info. You have the option to choose whether or not to sync profile pictures. I really like this new feature as I was previously using an app called FriendSync to sync my iPhone contacts with my Facebook friends and it never seemed to work properly.

The Facebook for iPhone application is one of the most popular apps (not surprising) with over 23.5 million monthly active users and over 11 million daily active users. It’s one of my favorite iPhone applications and I use it everyday (more than once).

What do you think of these new features? What other enhancements would you prefer to see in the future?