The Facebook app for iPhone has been updated to include a few new features.
Map View for Places, Event Check-Ins and the ability to unfriend people are the more obvious change.
Though there is also another fix which you will notice in the notifications panel. Thumbnails are now bigger.
According to the changelog on AppStore description:
What’s New In This Version:
– Added Map View for Places
– Added the ability to Check in to Events that you’re attending
– Added the ability to unfriend from the phone
– Improved News Feed
– Improved notifications UI