Here is an obvious thing. Foursquare and its clones including Japan made clones have to be happy with the Facebook’s decision about their location service.
Anyway, they must have ideal strategies to beat their enemies. There’re a lot of clones here in Japan now. A big difference between Foursquare and Japan made clones is mobile clients. Most of Japan made clones support typical Japanese mobile phones unlike iOS/Android devices. It means they’re based on Japanese mobile phone culture. This difference is making some innovative movement right now. They get some ideas from typical Japanese mobile phones.