Facebook just placed a $19 billion bet on the mobile messaging service WhatsApp, which has grown to a staggering 450 million monthly users in only a few years—many of them in fast-growing international markets like India, Brazil, and Mexico. But there’s one market where WhatsApp has failed to make much of a dent, and that’s in China. Here, Tencent’s WeChat, better known as Weixin in Mandarin, has taken a commanding lead in the world’s biggest telecom market.
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