Given this shift, the user-generated content (UGC) is expected to be a major momentum to drive further development of Internet. While tons of services are built on UGC, Shenzhen-based startup Aipai is the only one that offers all-around video services, ranging from UGC video site Aipai.com, video editing software Paidashi, and an SDK for game developers to integrate game recording features. The contents of Aipai.com are mainly focused on game commentary and entertainment. Of course Aipai is not the only player in game video commentary sector, given the booming development of gaming industry in China. Started out as a video streaming site for ACFUN, DouyuTV, a direct competitor of Aipai, is dedicated to game commentary businesses by adopting a differentiating feature Danmu, allowing audiences to post comments directly on top of the streaming video.