The mobile messaging service WhatsApp is now reportedly being used by a billion people every month.
The app, which is owned by Facebook, now outperforms the social network's own messenger mobile app which currently has around 800 million monthly users.
The company reported 42 billion messengers and 250 million videos were sent over WhatsApp daily.
According to an analyst however WhatsApp still trailed behind local competition in some key markets.
Mobile analyst at IHS, Jack Kent, said: "There are big markets where WhatsApp isn't the dominant player.
"WeChat in China has more than 500 million users, while Line is popular in Japan, and Kakao Talk is big in South Korea. But WhatsApp is certainly the most internationally successful.
"Part of that is down to its pure focus on communication, providing low cost chat that is very reliable.
"Other apps have focused on monetisation, games and stickers but WhatsApp's appeal is that it is light on monetisation and it has now dropped its small annual fee completely."
Facebook bought the mobile messaging app in 2014 in a deal worth £11.4bn.
Mr Kent added: "Facebook had just started pushing people to its own standalone Messenger app, when it bought WhatsApp. But there was a risk it could have been acquired by a competitor and Facebook would lose millions of highly-engaged mobile users to a
"But WhatsApp still faces those challenges from domestic players who monetise their services very well. It remains a competitive area."
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