What are some of the automated algorithms used to combat SPAM on Stack Overflow?
The more details the better :)
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It's unlikely that you'll get much information on this front. While security doesn't depend on secrecy, you don't hand your security plans to the burglars either.
That being said, they haven't done much more than what is considered normal industry practices, customized for the community of spammers SO attracts.
You should be able to get a lot of good information on general strategies and techniques used to prevent spam on Stackoverflow itself: