The new software promises better integration with Facebook. The upgrade will enable you to log into Facebook just once, and then you will be able to post to the social network from a variety of apps. You can also post about websites directly from Apple's Safari browser.
Siri will be there to post status updates you dictate to her. Siri will show you what she's going to post so you can correct typos before you approve it.
Facebook will be integrated with Apple's online app store so that you can declare that you "like" specific apps there, as well as songs and movies in iTunes.
Events in Facebook's calendar and birthdays of Facebook friends will also appear on your phone's calendar.
Image: Phil Schiller, Apple's senior vice president of worldwide marketing, talks about the panoramic features of the new camera and iSight during an introduction of the new iPhone 5 in San Francisco, Wednesday Sept. 12, 2012.