Requires App Review.The user_photos permission allows your app to read the photos a person has uploaded to Facebook. The allowed usage for this permission is to create physical or digital books or albums of a person's photos, which includes permitting people to export photos for printing. This permission can also be used to provide people with the ability to display their photos with other app users, for example in dating or social apps. It can also be used to provide people with the ability to edit or create new photo content based on existing photos. You may also use this permission to request analytics insights to improve your app and for marketing or advertising purposes, through the use of aggregated and de-identified or anonymized information (provided such data cannot be re-identified).