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That might cause me to ask questions like how I felt about the message on the sign. If it was, say, my support for a political candidate I’d be calling the ACLU and local media. If, as in the case of Twitter, it was something untrue about the upcoming election left by someone at a party who I’d already had to ask to behave better, I would probably regret only that I hadn’t asked them to take their sign and leave earlier.