WhatsApp, instant messaging service for mobile smartphones,
It has virtually doubled active users,
rising from 200 million in April 2013 to the current 430 million today,
with a consequent increase in the traffic of messages:
from 20 million in 2013 to 50 million daily.
Data on users of WhatsApp,
They were announced by the CEO of WhatsApp: Jan Koum.
The main competitors of chat services, WhatsApp, are: