Privacy and security concerns, as the others have stated. I am careful to not reveal much about myself on the Wrong Planet (e.g. name, photo, dates, specific places, etc.). Now, I am fine with being an Aspie. In fact, it's afforded me distinct edge (although it can hard too, of course).
For these reasons, remember that the Wrong Planet is not a social networking site or directory listing. Instead, we have our common neurology with lots of variation on the theme. Regardless of right/wrong, being an Aspie is simply unacceptable to many/most in this world. For those of us with professional positions, for example, disclosure is not appropriate. I cannot, and will not, give any specifics about my identity. Otherwise I'd be happy with sharing photos and all.
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The ones who say “You can’t” and “You won’t” are probably the ones scared that you will. - Unknown