Baku. 7 September. REPORT.AZ/ Facebook is having a run of milestones lately.
A billion people used the social network in one day at the end of August and now its WhatsApp messaging app has hit 900 million monthly active users, Report informs citing foreign media.
Facebook bought the app at the start of 2014 and during that time the userbase has more than doubled, with 100 million people joining the service in the past four months alone.
The milestone was announced by WhatsApp's co-founder Jan Koum on his Facebook page.
Facebook's founder Mark Zuckerberg was among the first to congratulate him and even posted a photo of Mr Koum as he posted the status update.