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Context: I'm getting lots of spam accounts (about a dozen a day). I can eliminate the majority of them using keyword filters, but they seem to be created by hand (e.g. human tests don't help), and are still coming even after I've blocked URLs and other contact info from user profiles.
The most common spam is for Vietnamese gambling sites, but I've had some boring stuff, like U.S. dentists, and some positively Shakespearean stuff, like cockfighting.