Concerns over how third-party developers can use facial recognition data from the iPhone X are being raised by groups like the ACLU and Center for Democracy and Technology. They believe developers could potentially use face scanning info in an improper way.

Apple lets developers grab some pieces of data, like a "rough map" of someone's face or a "stream of more than 50 kinds of facial expressions." The only requirements are that they get customer permission and don't sell the data to others.

The intention with this ability is that developers may want to build features around that data, but abuses of the info are conceivable. Apple says the bits of data developers can take wouldn't be able to unlock Face ID, so allowing that kind of collection isn't an issue.

Some of the privacy concerns center around the way advertisers may collect data about how people are reacting to ads based on their expression. Even though Apple has a policy against this sort of use, privacy groups are worried about an "inability to control" what developers do with the info they collect.