Aside from the social control aspect, the Great Firewall also acts as a form of trade protectionism that has allowed China to grow its own internet giants, such as Tencent, Alibaba, and Baidu. China has its own version of many foreign web properties, for example: Tencent Video (YouTube), Tencent Weibo (Twitter), Qzone (Facebook), WeChat (WhatsApp), Ctrip (Orbitz and others), Zhihu (Quora). With nearly one quarter of the global internet population (700 million users), the internet behind the GFW can be considered a "parallel universe" to the Internet that exists outside.