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I would bet there are cuneiform tablets with a “posting does nothing” argument on them somewhere.
Probably in a British museum, if we’re being real. Don't know about cuneiform, but Greek ostraka certainly must have been used for that on occasion. I’ll be honest, it comes to mind first mostly because of Ea-nāṣir. We can hope the bad customer reviews had some effect at the time and not just now 3700 years later :-) If we are being really real then the British Museum would have sold them off to a private collector on eBay :-) maybe not phrased quite that way, but likely Some people want to think talking doesn't lead to action. 
