How do you link your iPhone contacts with Facebook?

[anon]

For example, how do you get someone's Facebook profile photo to come up on your iPhone contacts. It does it for some, but others it doesn't, I'm confused.

[Clarence]

Some people do not, however, want their Facebook profile picture to show up in public ... Click the "Edit Your Settings" link under the "Apps and Websites" heading at the bottom of the page. 4 ... How to Go See My Picture Tag in Facebook.

[Richard]

Using your iPhone, add your Facebook contacts so that you can reference your ... The “Sync” option enables your Facebook contact information to be added to ...