The real trick to both use and deflect this is to have some piece of information about yourself that sounds very personal but that you would be fine sharing with everyone. I use autism disclosure this way, not only for this purpose, but also so that when people who I have met try to think of examples of autism, they don't just think of fictional evidence.
Also, this shows up in HPMoR's chapter 7, titled Reciprocation.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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