Keep in mind the Privacy Laws of this country, too. What everyone does with their private information and ID is their legal choice unless required by some form of law enforcement.
This is a forum, like it or not you cant enforce any part of asking for real ID or even first names. You can only ask.
If folks want to post their real name, fine, it's their right. But if they dont want to, it's also their right. Making this a requirement would be a huge can of worms.