Messaging and VoIP service WhatsApp has now hit 900 million monthly active users, chief executive Jan Koum revealed in a Facebook post. Koum updated his status along with Facebook CEO Mark Zuckerbeg and there was this bit of social media bonhomie: To put this in context, earlier in March, WhatsApp hit one billion downloads on the Google Play Store, as indicated by this VentureBeat report. The report added that WhatsApp was the second non-Google application to cross the milestone (the first being Facebook). Other applications which have crossed one billion downloads on Google Play are Google Maps, YouTube and Gmail. In April, Koum claimed that the service had hit more than 800 million monthly active users. and in January this year, WhatsApp claimed that its users were sending over 30 billion messages everyday. Meanwhile, WhatsApp parent Facebook reported a mobile daily…
