Imagine being "tagged" in a photo of someone who, without your knowledge, is involved in criminal activity. Since you are tied to that person, will that be justification for authorities to pry through your personal life, which they will justify by saying they were only trying to conduct a "thorough investigation?

http://www.naturalnews.com/036267_Facebook_facial_recognition_tracking.html#ixzz1ykXaGrJu

http://www.informationweek.com

http://techcrunch.com