Family keeps pretty rigorous genealogy around so I've got way too much background in the field and my own 'stock book' to think I haven't got some non-European in me, even though most of that will be Russian 'Asian' or Mongol Horde mix-in.

I would actually be very surprised if geeks in general didn't have a higher percentage of 'white' than the planet as a whole, but I'd guess that mostly comes down to 'where's the money?' and where has literacy as 50%+ of the population been common for multiple generations. Hard to get much penetration for novels and comics and so on if the market's not there to saturate, meaning probably not very many geeks from Ethiopia... in fact I'd bet you could closely match up geeks to both GDP/cap and Literacy rates, and that anomalies would be rather interesting in of themselves.

I do also often click on user names to see their profile if they're not recognized to me and they wrote something I found interesting or plan to reply to, and a lot list non-Western countries, so while I'd expect a slant in audience I don't think it's all that big and has probably been declining toward norm for a while now. That's just educated guesswork though. Fantasy, outside of Conan and LotR, generally hasn't done well on the big screen or TV like a lot of SF does, so it might be anomalous compared to geekdom in general.