Australian organisation Missing Persons Action Network (MPAN) has launched a campaign called Invisible Friends, asking people to add the profiles of missing people as friends on the social media platform.
Facebook's new facial recognition tools will automatically tag people in photos, even if they're in the background. Users will be notified, and asked if they want to be tagged in the photos.
Facebook hasn't revealed how accurate its facial recognition feature is, but its DeepFace algorithm identified people in a 4,000-person database with 97.35 percent accuracy.
