Here's how you can download the official Facebook app free for your iPad, iPhone, iPad mini or iPod Touch.
Download the Official Facebook App Free From iTunes
1. Go to the Facebook app preview page in iTunes.
2. Click the View in iTunes button.
3. Click the Free button to download the app.
4. Sync your iPhone or iPad with iTunes to install the Facebook app.
Download the Official Facebook App Free From the iOS App Store
1. Open the App Store on your iPhone or iPad.
2. Search for "Facebook" (without the quotes).
3. Tap the Free button to download the app and install it on your iOS device.
Here's a description and screenshot of Facebook for iOS devices:
"Keeping up with friends is faster than ever.
• See what friends are up to
• Share updates, photos and videos
• Get notified when friends like and comment on your posts
• Text, chat and have group conversations
• Play games and use your favorite apps"