Facebook and Twitter aren't the only social media platforms blocked in China. Chinese users are unable to access Snapchat, either. Youtube is also blocked.

Keeping western firms out has given Chinese tech companies ample time to develop their own networks.

A few of those homegrown platforms are now flourishing.

Related: China tech companies on spending spree

Weibo and WeChat boast hundreds of millions of users, while streaming video sites Youku, Sohu and iQiyi are very popular.

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