WhatsApp users send over 30 billion messages a day
WHATSAPP now has more than 700 million users who send over 30 billion messages a day.
The messaging app is now bigger than Twitter and Instagram combined, and far larger than any of its competitors.
And it is growing quickly - in February, it said that it had "more than 450 million" users.
That is likely to continue as WhatsApp rolls out new features. Its next big announcement is widely expected to be a voice calling feature.
Jan Koum, the WhatsApp founder and chief executive, announced the new figures in a Facebook post to celebrate the new year.
Comments on the post were all supportive of the service's growth, congratulating Koum and calling the app a "great product".
Facebook bought WhatsApp for $19 billion (£11 billion) in February last year. Koum joined the Facebook board after that deal was completed.
WhatsApp is becoming more and more involved in people's every day lives - WhatsApp evidence was recently said to be used to divorce nearly half of Italian adulterers.