You can download the update directly on your device through the Apple App Store or by using the following link:
Additionally your frequently messaged friends will appear near the top of your favorite list for easy access. Facebook for iOS makes it easier to chat with your friends and share multiple photos.
Facebook for iOS version 5.1 has the following features and improvements
- Swipe left anywhere in the app to quickly see who's available and send a message
- Add friends you message most to the top of your Favorites
- Share multiple photos fast
- Give real gifts to your friends using Facebook Gifts (US-only)
- When sending messages, see who's active so you and your friends know how soon to expect a reply
- To sort your feed, tap the button next to News Feed in the left sidebar.