Japanese sites are a mistery to me. They don't apear on my search resulsts and even if they did I wouldn't understand them. Japanese people don't usually come out of their Japanese sites also.

I was impressed how few Japanese users were registered on the whole MyAnimeList site, it's was based on somebody's search, not mine, but it looked pretty close to reality. Don't remember the exact number but I don't think the results reached 20 members.