http://bostonreview.net/cass-sunstein-internet-democracy-daily-we

In a system with public forums and general interest intermediaries, people will frequently come across materials that they would not have chosen in advance-and in a diverse society, this provides something like a common framework for social experience. Producers of communications might disclose important information on their own, about the extent to which they are promoting democratic goals. To the extent that they do not, they might be subject to disclosure requirements (though not to regulation).