I also think I'd prefer manual intervention rather than risk blocking false positives.
But this does depend on how frisky the culprit is and how much time we are prepared to spend deleting and blocking.
When I finish migrating the front-end to Go, I'll give you a really big button to ban spammers. 2 clicks, and it will nuke someone with great vengeance.
Manual intervention, but taking much less time would be great.
@Velocio started
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I also think I'd prefer manual intervention rather than risk blocking false positives.
But this does depend on how frisky the culprit is and how much time we are prepared to spend deleting and blocking.