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This is the meat of it, isn't it? There are two distinct needs, it seems: 1. Acknowledge the good conversation/point, 2. Bring others into the discussion. These two functions are being conflated into a single device, rather than separate actions. "...acknowledge the other person/conversation when said conversation is coming to a close. Like a I have nothing left to add here but I want you to know I saw this and I feel like it’s a natural human reaction like nodding or smiling at somebody..."