Facebook defenders: Is it really OK to mess with people’s heads?

I have a couple of questions for anyone defending the ethics of Facebook's recent "emotional contagion" experiment on nearly 700,000 unsuspecting users: would it be OK to mess with the heads of your closest friends and relatives -- your children, even -- without their knowledge? If you say yes, what if a few of those … Continue reading Facebook defenders: Is it really OK to mess with people’s heads?