Disable the Default Wordpress Comments

Is there anyway to disable the wordpress comment portion of the plugin? I don't want any anonymous comments where people can put anything for "Name" etc. I would just like to use Facebook, Twitter, and Google.

Previously I allowed comments for only registered users and forced registration with Ultimate Facebook plugin. I'd like Twitter users to be able comment now with this plugin, but seems kind of pointless to force them to register with Facebook so they can comment with their Twitter account.