As you can tell I'm new to this forum
But I'm seeing all these threads closed for spam, and was wondering if the Mods / Administrators are using any plugins like StopForumSpam.
I've used it on my site, and what it does is checks new users against their IP list / E-Mails, and any that match can't sign up automatically, though the Mods / Admins can manually validate the account if they wish.