I used to use my real name, until my boss told me my HN comments showed up in his Cortana results when all he wanted to do was search for my email address in his personal contact list. A decent person will feel at least a little bit like a creep searching for someones name on Google to dig up personal details about them, but when all that info just comes along with their email address, it just doesn't sit right. My boss even felt compelled to tell me it happened, not because he saw anything bad, but because he felt like a creep just getting the info like that. Then I started thinking about all the Windows users in the business world that might get the same results under the same conditions, and I just don't need everyone I interact with, across the country, knowing, for example, I'm an atheist before they send me a request to add a new question to a web form.