owever, heavily monitor messages on social networks and limit searches primarily to e-commerce sites in China. Instant messaging service QQ, which is similar to Skype, is used by a majority of young people for video chatting and Voice over Internet Protocol (VoIP) calling. Tencent Holdings Ltd., a public company based in Shenzhen, China, owns QQ. Some Chinese residents also use MSN, Twitter, and Skype. However, Sina Corporation's Weibo is the most popular microblogging site in China and supports social networking functionality, as well. Its features include groups, audio messages, and direct video uploads to complement its microblogging service. Search company Baidu maintains the lion's share of search customers in China. Its main competitor, Google, has a market share of less than 20 percent. As in the United States, a large portion of Google's revenue in China is derived from advertising on its site. Asian Market Table 8-2 Mobile Providers in China Company Name Services Notes China Mobile GoTone: postpaid brand. The largest mobile provider worldwide. M-zone and Easyown: prepaid, lower-cost services Owns 90% of Pakistani wire- marketed to students and less provider Paktel. young people. Currently is trial-testing Offers services to corpora- Time-Division Long-Term tions as well as individuals. Evolution (TD-LTE). 3G service is based on Chinese-developed Time- Division Synchronous CDMA (TD-SCDMA). China Unicom Second largest fixed-line and Telefónica owns 9.5% and has mobile provider. a strategic partnership with WO is its 3G brand. Unicom for roaming, equip- ment purchases, and research Ru Yi 133 is its prepaid GSM and development. brand. Its 3G service is based on WCDMA. China Telecom Third largest mobile provider; Announced it will use LTE largest fixed-line provider. for its 4G service. Offers Internet access and The only CDMA provider in television service. China. China has four main social networks: Renren, Kaixin001, Qzone, and Pengyou. Renren is China's largest social network, and like Facebook, it starte