Employers should ban those providing them with this info. It is these people that are and should be controversial. If your company is connected to them and uses their services, it should be made public. Behavior will change yesterday. Imagine you are connected to people cancelling other on internet rumors you cannot verify. You can search for a new country immediately and especially the professional world would not want to associate with you. Applying the same rules would do quite a bit although companies above a certain size only care for certain types of reputational costs.