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Men Overran a Job Fair for Women in Tech
(www.wired.com)
This is a most excellent place for technology news and articles.
I've been hiring a long time and I've never seen two candidates that were perfectly equal. Especially after going through the interview process and having a chance to speak to them and see how they carry themselves. I obviously can't speak for every company but at mine we don't even see demographic information when reviewing applications. I couldn't select for race/ethnicity if I wanted to.
The same thing would happen if you had only spoken to women at a career fair and deliberately only hired women.. The only fair way is to give everyone an equal chance to apply/speak to you. Like you said, get the word out everywhere not just to particular communities. With job sites and linkedin this is relatively easy. My company advertises on the radio/internet when we're hiring as well.