The information synced to Facebook albums has changed in iPhoto 9.5.
- For albums first synced to Facebook in iPhoto 9.5, iPhoto will sync the information in the description field for the photo to the caption on Facebook.
- For albums first synced to Facebook in an earlier version of iPhoto, iPhoto will continue to sync the information in the title field to the caption on Facebook.
If you would like the existing Facebook albums to sync with iPhoto's description field instead of the title, remove your Facebook account in iPhoto's Accounts preferences, and then re-add it.
Photos in your Facebook albums that are not stored locally in your iPhoto Library do not have a description field in the Info panel. Because of this, you won't be able to update your Facebook caption for these photos within iPhoto.