Facebook activated a new function… This is Tag Suggestions (auto tagging) for photos. Facebook can recognize your face when you are tagged in another photo.
If you don’t want to enable photo-tagging automatically about you (on photos of other users) search Account (top right corner) > Privacy Settings > Customize settings > Things others share >(When photos look like me, suggest my name) and disable this function.
I hate it… Facebook can not be equal to ‘The Big Brother’!
(official blog post from Facebook: http://blog.facebook.com/blog.php?post=467145887130)