As is the case with FB, Twitter, and the other social networks, young people will not see a problem with this, at least while they're young. As they grow older and live their lives, and have medical problems, have brushes with the law, have problems at work, etc etc, and more information is collected, they will realize one day that the sum total of the profile now collected about them, in the cloud, is suddenly having a genuine real impact on their lives... and it will be too late. Years too late.