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not sure about the regular News module, but if you get the newer release, News 1.2 (from
http://dev.xoops.org), you can set permissions for Submitting, Approving, and Viewing
the weblinks module has an option in the module Preferences that allows you to disable submissions, i believe.
either way though, if a user submits news, you just have to delete or ignore it, it doesn't get automatically approved unless you enable that option.