To manage the posting of messages in a discussion, you can assign a collection of users or a single user to moderate the discussion. Discussion moderators can approve or reject messages. Discussion moderators with Admin access to a discussion can edit messages before approving them. Messages posted in moderated discussions do not appear to users in the discussions unless approved by a moderator.
If a user has posted a message to a moderated discussion, that message will not be visible until a moderator approves the message. If a user has edited a message in a moderated discussion, the changes will not be visible until a moderator approves the change.
When at least one moderator is set for a discussion, that discussion is marked as a moderated discussion and anyone with Admin access to the discussion can also act as a moderator.
To assign a moderator to a discussion:
In the Discussion Explorer portlet or the Discussions application view page, right-click a discussion in the navigation pane.
Click 
Edit.
Make sure the Properties tab is selected in the Edit Folder Properties dialog box.
Click Moderators.
In the Choose Users dialog box, select the project personnel whom you want to make moderators of this folder and click Finish.
In the Edit Folder Properties dialog box, click Finish.
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