Asiajin has an interesting post on Chinese game developers infiltrating Japan's largest online social network Mixi. And yes: its farm games :-)
Mixi's no 1 ranked app currently is Sunshine Farm by Chinese developer Rekoo. The game reached two million users in less than two months since its launch. On no 3 is already the next China-developed game Everyone’s Farm with 500,000 users by Yicha.