I was curious so I scraped my "new follower" emails from Pinterest and graphed them over the last year, separated by gender: http://a.yfrog.com/img814/1332/r5g

I was curious so I scraped my "new follower" emails from Pinterest and graphed them over the last year, separated by gender: http://a.yfrog.com/img814/1332/r5g.png http://a.yfrog.com/img814/1332/r5g.png It's a pretty small sample size, but at least among my friends it's really taken off in the last couple months.