Facebook has re-enabled facial recognition for US users.
As we announced last year, we temporarily suspended our photo tag suggestion feature to make some technical improvements. Today, we're re-enabling the feature in the United States so that people can use facial recognition to help them easily identify a friend in a photo and share that content with them.
Users may want to change settings to avoid this.
http://nakedsecurity.sophos.com/2013/02/02/facebook-turns-facial-recognition-back-on/