Kidding aside, an app like this could help people with conditions, such as autism, that makes it hard for them to read emotions. The app is supposed to work entirely on Google Glass' CPU, so it doesn't need to send the images Glass records to the cloud. That means the app could work when the glasses don't have a data connection, which is nice. It could also keep the images the glasses record for the app more secure—the images are supposed to stay on the device and never enter the cloud.