I have a blog and a youtube channel that talks about raspberry pi, open source, embedded, and other programming projects that I do for fun in my spare time. I checked the youtube stats yesterday and my female audience was 0% (not rounded down, it was 0.0% according to Youtube) among about 10K people who watched them last week - globally. When I had google analytics on my site, it reported the same thing. Because my channel is new and no one knows whether I am a sexist person or not, so we can safely filter out the reputation problem. Also, I have a foreign name so people can't guess my gender by looking at my name. I think that anyone who watches my video has to be curious about what I do, not because they are used to me talking in a certain way.
Now my channel is a small sample, but I have a feeling that not many girls find tech (or at least what I do) fun and appealing the current way it is while many boys do. So it's just about an opportunity, money and job and whatnot as it is a hobby, a thing to have fun with that attracts certain demographic to a profession.
And the stats are not surprising, I have about half females, and they participate way more in "girly" things.
The same happened in another forum I had.
I wouldn’t be surprised if some women were miscategorised by whatever algorithmarked their gender.
For everyone's reference, for some reason dang migrated this comment thread wholesale from https://news.ycombinator.com/item?id=16510442
"I asked Wendy Williams, founder and director of the Cornell Institute for Women in Science, what she makes of these findings. She wrote that if girls expect they can "live a good life" while working in the arts, health or sciences, then girls choose to pursue what they are best at—which could be STEM, or it could be law or psychology. She added, "However, if the environment offers limited options, and the best ones are in STEM, girls focus there...""