Facebook owned mobile messaging app, WhatsApp, has just hit another big milestone this week and are celebrating the fact that they’ve just hit 600 million monthly active users, according to CEO and founder Jan Koum. That’s a pretty impressive number considering that its active users and not registered users which is  much higher number.

WhatsApp founder and CEO Jan Koum tweeted the milestone yesterday stating that the messaging app has 600,000,000 monthly active users. Cor blimey. He also noted that active and registered are very different numbers indeed. Earlier this year WhatsApp announced that they had over half a billion registered users on the service which is a significant difference between the two, but its clear that Koum was digging at Line and Kik who have only released registered numbers, not active numbers.

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