The Chinese government operates the Golden Shield Project, a massive firewall and content monitoring initiative. The project reportedly employs 30,000 staff with a funding in excess of 800 million dollars. A broad range of sites are censored, and this provides a platform for surveillance of network traffic in China. So, how can you find out if your site is censored in China?
Several services such as websitepulse provide free testing services to validate your site from proxies inside China. Since blocking happens at a regional level, the tool allows testing from three major Chinese cities.