Would screening 1st posts prevent spam?

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http://ubuntuforums.org – Hi All I was wondering, if all first posts by users were screened by the moderators, would stop annoying threads appearing in the support forums? The ones listing new episodes of something or another, or ones blatantly advertising. They are always a 'users' first post. Personally they drive me nuts :mad:. I doubt it would add too much to their work load & save me gnashing my teeth. :) Just a thought. Comments? (Hardware)