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For the last several months, my two-year old forum was continuously receiving spam user registrations and spam posts. I had to delete 13,000+ users and a lot of posts to clean up my forum. Of course, I know I had my fair share of faults since I'm always two or three months late before I upgrade to the latest patch or release. But what amazes me most was that after I've upgraded my forum software to the latest version and opened it to the public again, a new spam user was able to register in the forum, which surprised me – a lot.