Re: I think some people might have missed something...
There is a world of difference advertising in a periodical which is read by professionals or on a similar website and restricting visibility of the ad's.
Whilst the majority of computer weekly subscribers were male, our female colleagues were not restricted from subscribing and did so. Similarly I'm sure the vast majority of IT job seekers in the up registered with jobserve are male, but my female colleagues also register when job hunting.
It would never offer to me that when Facebook show me a job advert about a PM role that the female colleague at the next desk would not also be presented with the ad.