Therapy Goes Digital: Is the Internet good for your head?

The Internet is celebrated and castigated in equal measure -- but is it good for your mental health? Are you compelled to check your email morning, night and day? Some believe Internet Addiction Disorder is a very real and growing concern. Others aren't at all convinced it exists. Also, the rise of psychological therapies online -- from depression to social phobia or bulimia -- can a computer really replace your therapist?