The "Great Firewall" in China has over 600 million active Internet users. That's double the population of the United States. Baidu is the dominating search engine, there are replacement services for Twitter, Facebook, and others. Their IM "Wechat" has over 300 million active users alone.

In all reality, Google, Facebook, and others would _love_ to have even the smallest presence in China to get access to that user base. It's a gold mine just waiting to be cracked. Until they are, it will be referred to as "The Great Firewall", when in reality, Chinese internet users probably aren't really missing a lot, outside of politically charged sites, perhaps.