A reader shares a report: Apple won accolades from privacy experts in September for assuring that facial data used to unlock its new iPhone X would be securely stored on the phone itself. But Apple's privacy promises do not extend to the thousands of app developers who will gain access to facial data in order to build entertainment features for iPhone X customers, such as pinning a three-dimensional mask to their face for a selfie or letting a video game character mirror the player's real-world facial expressions. Apple allows developers to take certain facial data off the phone as long as they agree to seek customer permission and not sell the data to third parties, among other terms in a contract seen by Reuters. App makers who want to use the new camera on the iPhone X can capture a rough map of a user's face and a stream of more than 50 kinds of facial expressions. This data, which can be removed from the phone and stored on a developer's own servers, can help monitor how often users blink, smile or even raise an eyebrow.