WhatsApp leads the rest of the mobile messaging field when it comes to popularity, and now the Facebook-owned service has passed 600 million monthly active users, according to CEO and founder Jan Koum. Now serving 600,000,000 monthly active users. Yes, active and registered are very different types of numbers… — jan koum (@jankoum) August 25, 2014 The app crossed the significant half a billion user milestone in April this year. Tencent’s WeChat app is closest behind with 438 million active users, most of whom are likely in China, while Tango (70 million active users) and Viber (100 million active users) are among…
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