Spamnesty is a simple service: forward your spam to it and it will engage the spammer in pointless chatbot email chains, wasting their time.
If you get a spam email, simply forward it to firstname.lastname@example.org, and Spamnesty will strip your email address, pretend it's a real person and reply to the email. Just remember to strip out any personal information from the body of the email, as it will be used so the reply looks more legitimate. That way, the spammer will start talking to a bot, and hopefully waste some time there instead of spending it on a real victim. Meanwhile, Spamnesty will send you an email with a link to the conversation, so you can watch it unfold live!
The conversations are indeed posted live, and some are quite funny. It's fascinating how obvious it is when a spammer switches from their own bot to giving a human response, and satisfying to see them fooled.
Have you met Lenny?