The current Facebook app for iPhone get updated to include Facebook’s new group feature, various bug fixes and places support. You can either get Facebook 3.3.1 from the download link given at the end of this post or update the current version of  your facebook via iTunes.

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Download Facebook 3.3.1 for iPhone

From the App store:

What’s New in Version 3.3.1

– Groups: share photos and posts with small groups of friendsÂ
– Deals: discover great deals around youÂ
– Places: tag more friends after you check in, add photosÂ
– Various bug fixes

Download Facebook 3.3.1 for iPhone from here.