Elizabeth Sweet, writing in the New York Times, way back in 2012 on her research into the role of gender stereotypes in the marketing of toys: During my research into the role of gender in Sears catalog toy advertisements over the 20th century, I found that in 1975, very few toys were explicitly marketed according to gender, and nearly 70 percent showed no markings of gender whatsoever. In the 1970s, toy ads often defied gender stereotypes by showing girls building and playing airplane captain, and boys cooking in the kitchen. » about 400 words
Danah Boyd posted about the biases of links over at Many2Many the other day. She looked for patterns in a random set of 500 blogs tracked by Technorati as well as the 100 top blogs tracked by Technorati. She found patterns in who keeps blogrolls and who is in them, as well as patterns about how bloggers link in context and who they link to.
The patterns Boyd points to would certainly effect the Google Economy, our way of creating and identifying value based on linking structures. And though she’s emphasizing gender differences, the patterns show broad differences in linking patterns between content types as well.