Facebook re-enables photo tag suggestions – Facebook announced Thursday that it is re-enabling the photo tag suggestion feature in the U.S., which uses facial recognition to help users identify friends in their photos. The controversial feature launched in late 2010, and was removed temporarily last year while Facebook made technical improvements and considered privacy matters. The feature uses algorithms to group photo uploads by those with similar faces, then it suggests friends those faces may belong to by matching them with previously tagged photos of friends. Users can adjust or approve those tags. The feature is on for users by default.