I'm actually not convinced this is possible, given that the number of FAA-certified pilots probably approaches or exceeds the rest of the world.
I do think we should try. I'm not familiar with flying outside the US, but we seem to already have quite a few European pilots. Is it simply matter of them asking and answering questions to seed the topics, even if they're questions they already know the answer to? Or once the site reaches public beta will that become a moot point as more non-US pilots begin to participate?