This reminds me of the Amazon product Q&A section. Someone will respond to a question with "I'm not sure" likely because Amazon notifies purchasers when someone asks a question.
Oh absolutely, I've been getting more and more email from Amazon Q&A telling me that I recently bought a product so I should try to answer a question about it.
On the other hand, I did ask a question on Amazon just yesterday and have received 5 answers in under a day, so it their system does work to some extent.
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