WhatsApp Pushes Past 400 Million Monthly Users

WhatsApp - the little messaging system that could -- announced today that it had surpassed a major user base milestone, topping 400 million monthly users, and active ones at that. That number is double what WhatsApp reported in April, establishing WhatsApp as not just one of the most rapidly growing services on the Internet, but also as a viable competitor to text messaging services as we know them… 

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