You can now unfriend Facebook contacts on your iPhone, thanks to a recent update for the Facebook iOS app.
Other new features in version 3.4 of the app, which was released this week, include an improved news feed and an improved notifications interface.
The ability to check in to events you are attending has also been added - previously you could only check in to venues and not specific events. Map View for Places has also been added.
The app is free to download and is compatible with the iPhone, iPod touch and iPad. You'll need to be running iOS 3.0 or later.