The algorithms are not only weighted towards the individual user - but also trends created by groups.<p>Take a 14-22 year range of males and visit the same sites as ages 40-65 and I guarantee they will also be shown different ads!<p>This 'study' doesn't really prove anything other than ads are targeted at groups and not just individuals and that the female group may be less interested in job ads - especially of higher paying jobs.<p>Which matches very well with employment data:
<a href="http://www.eeoc.gov/eeoc/statistics/employment/jobpat-eeo4/2013/table1/table1.html" rel="nofollow">http://www.eeoc.gov/eeoc/statistics/employment/jobpat-eeo4/2...</a><p>Females heavily gravitate towards lower paying, social-level jobs such as Kindergarten teachers, Nurses, and Psychiatry. Because this is <i>statistically true</i> of the gender, ads will take this into consideration.<p>TL;DR
Making imaginary mountains out of imaginary ant hills because spinning statistics is easy when you have confirmation bias.