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As a personal anecdote, the m/f ratio in a company (one of the biggest ISPs in my country) a friend worked was supposed to be 67-33, according to LinkedIn. When I told him that, he said that certainly it wasn't the case. He worked in their HQs, along with as much as 90% of their employees, and one of the first things that made an impression on him was that women were so much more than men. By the way, there are profiles of 183 employees of that company in LinkedIn, with the error margin not sufficient to explain the discrepancy.