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If you're tipping on SN then the person posting was not paid for a service, they originally put it up for free for the world to read. You are just giving them a gift afterwards.
I agree. I would say it's Value for Value.
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  1. there are many replies that because of context - are addressed personally to me (and free for the world only by the way)
  2. anyway, in most countries, giving a gift to a stranger creates a taxable event :))
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