"As of today, one billion people are using WhatsApp. That's nearly one in seven people on Earth who use WhatsApp each month to stay in touch with their loved ones, their friends and their family," WhatsApp said in a blogpost.
In February 2014, WhatsApp was acquired by social networking giant Facebook, its biggest buyout till date, for a whopping $19 billion.
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Also, there are one billion groups on WhatsApp, he said.
Previously, WhatsApp has said its service has seen a strong uptake, specially across developing nations such as Brazil, India and Russia.
"In India, more photos are sent using WhatsApp than in any other country in the world. As one of WhatsApp's largest user base, it's no surprising that the second highest number of groups are here," the company said.
WhatsApp competes with messaging apps like LINE, Viber and Hike in India.
Facebook chief Mark Zuckerberg also congratulated Koum and his team.
"WhatsApp's community has more than doubled since joining Facebook. We've added the ability to call your loved ones far away. We've dropped the subscription fee and made WhatsApp completely free. Next, we're going to work to connect more people around the world and make it easier to communicate with businesses," he said.
Zuckerberg added that there are only a few services that connect more than a billion people and this milestone is an important step towards connecting the entire world.
Recently, WhatsApp had said it will stop charging $1 per year subscription fee and will go completely free for its users across the world.
Also, it will not introduce any third-party ads for monetisation and is going to experiment with new models to stay ad-free, it had added.
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