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Oh, and Welcome to Wrong Planet huntedman!
3. you intentionally avoid people knowing your name and birthday, because you know you will never remember theirs and want to be on an even-ground
5. You have kept a piece of information secret from all but one person you know and challenged others that they "will never be able to figure it out", to study how information flows within the groups of people you know
It was years before I realised I did 5. Setting a social trap. A hunter uses a trap to catch a fox because he is rubbish at catching it himself. You set up a social situation so you can study it because you cannot join in yourself. Maybe if you are using it as a defense mechanism you set up a predictable one so you can gain a sense of superiority at how predictably others behave.