Only 17% of Google’s engineers, 15% of Facebook’s, and 10% of Twitter’s are women. (Ref)
“the gender gap is not at all connected to innate ability; girls are not less likely than boys to be good at these subjects.
In fact, The Engineer reports that in the UK girls outperform boys up to GCSE level (exams taken at age 16). But after this, the further on you go, the fewer women you find pursuing these subjects.
For instance, women make up just 12% of engineering students at universities in the UK, and just 4% of those taking engineering apprenticeships.” (Ref)