![]() ![]() Filtering remains enabled even if users later link their account with a non-mainland China number, which means that users with accounts registered to mainland China will remain under censorship regardless if they travel or unlink their Chinese phone number from the account. We found that keyword filtering is enabled on WeChat for users with accounts registered to mainland China phone numbers. In this report, we provide the first systematic analysis of keyword censorship and URL filtering on WeChat to determine how the app filters content and the type of content that is blocked. Despite these concerns, there is limited technical research into the operation and scale of content monitoring and filtering. Accordingly, the popularity of WeChat has also been met with suspicions of surveillance and media reports of censorship. Operating a chat application in China requires following laws and regulations on content control and monitoring. WeChat is owned and operated by Tencent, one of China’s largest technology companies. It is estimated that Chinese users spend a third of their mobile online time on WeChat and typically return to the app ten times a day or more. WeChat encompasses more than just text, voice, and video chat it includes a rich set of features such as gaming, mobile payments, and ride hailing, which make it more of a lifestyle platform than a mere chat app. WeChat, ( Weixin 微信 in Chinese), is the dominant chat application in China and fourth largest in the world, with 806 million monthly active users. Websites that are blocked for China accounts were fully accessible for International accounts, but there is intermittent blocking of gambling and pornography websites on International accounts. WeChat’s internal browser blocks China-based accounts from accessing a range of websites including gambling, Falun Gong, and media that report critically on China.Some newfound censored keywords appear to have been added in response to current news events. ![]() Some keywords that triggered censorship in our original tests were later found to be permissible in later tests. ![]() More keywords are blocked on group chat, where messages can reach a larger audience, than one-to-one chat.In the past, users received notification when their message was blocked now censorship of chat messages happens without any user notice. Keyword censorship is no longer transparent.Keyword filtering on WeChat is only enabled for users with accounts registered to mainland China phone numbers, and persists even if these users later link the account to an International number. ![]()
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