Pattern recognition systems are deleted from labeled "training" data.
 Face recognition can be used not just to identify an individual, but also to unearth other personal data associated with an individual  such as other photos featuring the individual, blog posts, social media profiles, Internet behavior, and travel patterns
Face recognition systems have also been used by photo management software to identify the subjects of photographs, enabling features such as searching images by person, as well as suggesting photos to be shared with a specific contact if their presence were detected in a photo

