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I really hate it when someone at work will send me a direct message that simply says, “Hi.” I move on to something else, waiting for whatever should come next, but it never does. It’s only later that I realize that the person won’t continue until I say “Hi” back. I don’t understand why people need some sort of acknowledgment before they can convey their request. Just send it all in a single message. I don’t have time for that kind of nonsense. I guess the bright side is that it usually takes me so long to get back to them that they've reached out to someone else to answer their question.