Peter Parks/AFP
Weixin, the version of WeChat offered in China, has 396 million monthly users. Tencent dubbed the shutdown "Thunder Strike," and it comes just a month after the Chinese government announced its initiative to "clean up" instant messaging services like WeChat.
WeChat announced last week it would start to "protect [WeChat users'] experience and interests" by closing down fraudulent and illegal accounts. Many WeChat users use the three-year-old instant messaging service as a news source, but some people have used them to distribute illegal information, "seriously undermining public interests and order in cyberspace," said a statement from China's State Internet Information Office.