This article originally appeared on 60 Second Social.

When Facebook’s Mark Zuckerberg held talks with WhatsApp over what would become a mega, $19-billion takeover deal last February, he told the founders he’d love for their popular messaging app to “connect 4 to 5 billion people over the next five years.” It was an extraordinary mandate, yet WhatsApp may be gradually getting there.

On Monday it was announced that WhatsApp had hit 600 million monthly active users. In late April, the number was 500 million, meaning the app has been gaining roughly 25 million new active users each month.

When it comes to active users, WhatsApp is the most globally popular messaging app, followed by China’s WeChat and Japan’s LINE. WeChat has 438 million active users, and while it has ambitions to spread to the U.S. it has struggled to find a large base outside of Asia.

WhatsApp in return has yet to become big in China, Japan or South Korea, which are dominated by their own domestic services, but it’s huge in Europe.

The app can be found on nearly all smartphones in Spain and Hong Kong, according to the company’s own figures, and is regularly used by half the population of the Netherlands.

About The Author

Mark is the founder of 60 Second Social media where he provides social media news and digital marketing analysis, he is also a proud father of his bearded dragon, Lola. You can follow him on Twitter here. You can also follow 60 Second Social on Twitter here.