One of the most popular applications for iPhone and iPod Touch, Facebook, has just been updated to version 3.1 and now includes the long awaited Push Notifications.
Receiving the push notifications on your iPhone does not necessarily require that you have “Push” enabled, as this usually drains your battery rather quick. I have mine set up to check each hour so if there are updates, I will usually get them within an hour. Of course push notifications are more powerful if you get them instantly – so set it up to your own preferences.
Another new feature in Facebook 3.1 is the ability to synchronize information about your Facebook friends with the Address book in iPhone, including their phone numbers, e-mail addresses, profile picture etc.