China is notorious for banning/restricting foreign Internet companies in order to support the local market. Even if some kind of a service is not banned, there is often a local competitor with tens of millions of users.
Is there a Chinese alternative for Foursquare/Yelp? Checking out restaurants in Beijing shows that those services aren't super-popular there and I'm guessing the local people use something else.
It's okay if the service doesn't have an English version, as long as Google Translate can handle it.