I think everyone knows people with a variety of mental health disorders. It seems that we're just now getting comfortable with the idea that we can discuss these problems publicly.
I'd also say that since the "nerd" personality types (at least from a Myers-Briggs [1] perspective) tend to be over-represented here, we would probably also find a larger than average percentage of us with Aspberger's Syndrome [2] (now removed from the "Diagnostic and Statistical Manual of Mental Disorders" [3] and considered an autism-spectrum disorder).
I'd also say that since the "nerd" personality types (at least from a Myers-Briggs [1] perspective) tend to be over-represented here, we would probably also find a larger than average percentage of us with Aspberger's Syndrome [2] (now removed from the "Diagnostic and Statistical Manual of Mental Disorders" [3] and considered an autism-spectrum disorder).
[1] - http://www.myersbriggs.org/my-mbti-personality-type/mbti-bas...
[2] - http://en.wikipedia.org/wiki/Asperger_syndrome
[3] - http://en.wikipedia.org/wiki/Diagnostic_and_Statistical_Manu...