Quote:
Originally Posted by hairyfreak
As has been previously suggested, try implementing a captcha verification to the registration page. This tends to stop bots and automated scripts from being able to register, thus preventing most spam problems. If, however, the problem persists, you may be suffering from human spammers. I can't think of any way to block them except, perhaps, banning their IPs from your server.
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With captcha one of the problem is if you try to use better Captcha- it is hard to read, so you need to give some solution to reload the image. For human spammers you can set rule that a new member can only post urls once they've made X number of posts or they have been active for Y days, you can also scrutinize them by limiting the rights of new members. Also you need to add more moderators to keep watch on human spammers.