grounds, particularly under international law. The US companies Facebook and Digg sent cease and desist orders to the Australian company uSocial, which ignored them and continues to market "friends" and "votes". China, unlike many countries, has a strict cyber defamation law, and some Internet Water Army companies have been accused of violating it. Internet water army practices often result in privacy violations or damaged reputations, and the 2009 revision of China's Tort Liability Law stipulated that in such cases, "the victim has the right to inform the Internet service provider (ISP) to delete harmful postings and that the ISP must face joint liability for damages if it fails to act". China's State Council Information Office announced in 2011 that it "is working out laws to regulate the increasing numbers in the "Internet Army." Wang Chen, director of the office, announced that the Chinese government has paid constant attention to the posters and commentators, who have been found damaging social order both in the real and the virtual world." In 2007, the cosmetics firm Doctor Bai and health-food company BiosTime both sued the consumer protection website 315ts.net for posting fake comments about their products. "Judges eventually ruled in the website's favor because there was no evidence to suggest the posts were not genuine." According to a 2010 China Daily report, Mengniu Dairy denied paying a Wangluo zhujun company to spread false rumors about dairy products of their competitors Yili Group and Synbutra International. The Shanghai Daily reported in 2011 that the online shopping website Taobao shut down over 200 Internet Water Army companies selling microblog followers. Detection Internet water armies are a big threat for cyber security. Some scholars adopted the Dirichlet process mixture model (DPMM)-based GSP algorithm to detect Internet water armies from Tianya forum. They used DPMM to effectively analyze Internet water army user behavior and use the sequential pattern mining algorithms to determine paid posters' accounts. An information technology engineer, blogging as Chen Chuanliang Peter, claimed to have developed software that differentiated paid blog "followers", and found that about 17 percent of followers on Sina's ten most popular microblogs "never interacted or responded to those they were following. In other words, they were zombies." Cheng Chen et al. chose a detection case study of online comments about the 360 v. Tencent conflict between two major Chinese IT companies, each of which was suspected of paying for posts. In