"they" being the one whom post the spam... :
So, according to your long and elaborate answer, we know that the spammers use one or more proxies, and the users don't. That's actually great news. Block the proxy/proxies and the spammers are gone. A simple IP-based blacklist should be sufficient.
Alexander
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Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)
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