How to Sync iPhone Contacts to Facebook

1. Launch the App Store application on the iPhone by tapping its icon on the home screen.
2. Tap the 'Search' button on the menu across the bottom of the screen, and then type 'Facebook' into the search box that appears at the top.
3. Tap the entry for the official Facebook app from the search list, followed by the 'FREE' button. Tap the button again to confirm download and installation of the app.
4. Launch the Facebook application and enter your account user name and password in the relevant boxes. Tap the 'Sign In' button to continue.
5. Tap the square icon in the upper-left corner of the screen to reveal the options page.
6. Tap the 'Friends' button, followed by the 'Sync' button in the upper-right corner of the screen. Slide the 'Syncing' button to 'ON,' and tap the 'I Agree' button in the pop-up box that appears. Your iPhone's address book and Facebook friends list will now automatically synchronize whenever you launch the Facebook application.