Facebook has just released an update (v5.5) for its official iOS app. This update includes improved like, comment and share buttons and support for Facebook’s free in-app calling feature, wich is available in Canada and some parts of the US.

New button design makes it easy to like, comment and share posts in News Feed.

• Improved buttons to like, comment and share posts
• Share button to re-post stories from your News Feed now available in all languages
• Call friends for free right from Facebook (US and Canada)

You can downlaod the Facebook app for free in the App Store here.