Facial recognition systems use biometrics to identify individuals by comparing live or digital images to stored records. They are commonly used for security but also in other applications like driver's licenses and identifying shoplifters. Name Tag is a Google Glass app that uses facial recognition to identify people and provide their public Facebook profile. Facial Action Coding System analyzes facial expressions. Emotient uses AI to read emotions. While benefits include identity verification and criminal identification, concerns exist around privacy, mass surveillance, and lack of regulation on data usage.