I'm in the middle of setting up a website in China. The way things go is that you have to get the icp license. To get it, you have to agree that you will censor any user generated content that should be harmonized (guidelines are not very precise, but the chinese government regularly provide a list of topics that are not allowed for the season). We actually outsource our censoring to a chinese company for 500RMB/month as it'd be a hassle to hire someone only for this.

On the other hand, our website is bilingual, and we don't really need to monitor the english part since the government doesn't care...