From Page: The geek identity, knowledge, and power are all insistently gendered. Rachel Eddin in an excellent article on io9 points out that geek culture has long been defined as alternatively male, in opposition to traditional, physical, less-cerebral masculinity. On the one hand, then, male geeks use knowledge as an alternative way to demonstrate competence, a less martial way to be manly. At the same time, though, male geeks position on the margin is unstable窶"which is why they're nervous about geekdom being feminized. If women are "passing" as geeks, it starts to raise the question of whether geeks are "passing" as men.
Eddin concludes that "insularity and identity-policing will consume geek culture faster and more thoroughly than any legion of imaginary interlopers." I don't necessarily disagree with that...but at the same time, I wonder if the identity-policing and insularity is simply a caducous part of geek culture, or whether it's not a more integral organ. As long as geek identity is constructed through knowledge窶"as long as it is essentially defined by who knows the most about a particular collection of purchaseable cultural commodities窶"then it seems to me that its borders are always going to demand policing. Which means that, given geekdoms' relationship to masculinity and femininity, a lot of that policing is going to be gendered and misogynist.
For me, then, the "fake geek girls" meme doesn't so much call into question the bona fides of the women in question as it calls into question "geek culture"窶"real or otherwise. Eddin praises geeks for being wiling to "challenge cultural norms"窶"but are you really challenging the norms of a capitalist society when you define yourself by your relationship to the crap you buy?