It's very easy. All countries (except Somalia) regulate their markets. For example in the US if there are more than 500 investors in your company you are requir

It's very easy. All countries (except Somalia) regulate their markets. For example in the US if there are more than 500 investors in your company you are required to disclose certain information (I read about that regarding Facebook: http://dealbook.nytimes.com/2011/01/03/facebook-and-the-500-person-threshold/ http://dealbook.nytimes.com/2011/01/03/facebook-and-the-500-...) In the EU companies are required to disclose data about individuals to those individuals. In both cases what happened was that policymakers tried to work against a (potential) market failure they (fore)saw.