well, outdated, but personal data and its quality has indeed a value: http://www.statista.com/statistics/289505/social-networks-value-per-active-user/ http://w

well, outdated, but personal data and its quality has indeed a value: http://www.statista.com/statistics/289505/social-networks-value-per-active-user/ http://www.statista.com/statistics/289505/social-networks-va... also user generates revenue by themselves http://www.technologyreview.com/article/424650/how-much-is-a-user-worth/ http://www.technologyreview.com/article/424650/how-much-is-a... edit: updated link to more recent stats