2. Maintain a proper registration system
If you are to regulate the discussion, and to retrieve users of the forum, a proper system for registration is of the utmost importance. It should be organised in a way that makes it impossible to get around it with fake profiles or false information.
Even if you allow users to participate using aliases or nicks, the moderators ought to know their identities. This is significant if anyone is to prosecute those who have expressed themselves in a legally prohibited manner.
There are several ways to register users, for instance through a Facebook account, Disqus, aID and others. We find it difficult to recommend one system rather than another, but will advise you to allow some time searching for the system you find best.
Also, be aware that some media outlets - Nettavisen, for instance - have created systems of their own, as they do not find Facebook secure enough, due to its possibility for fake profiles.