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> Out of 4,037,953 GitHub user profiles with email addresses, we were able to identify 1,426,121 (35.3%) of them as men or women through their public Google+ profiles.

I wonder if there's a gender bias with regard to making your Google+ profile public (or having one in the first place).

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I also wonder how they actually verified the public G+ profiles. I know that a significant number of women in my circle of acquaintances deliberately flag themselves as male.

I randomly lie about my gender, age, and anything that could be used to identify me. I learned this from others, and have also encourage my spouse/children/etc. to do the same (which they seem to do).

There is no compelling reason for me to provide any real information about myself online.

I get the feeling the peer review is going to flesh some of these issues out. I would love to have time to go over their sample selection.

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