WhatsApp, the popular mobile instant messaging service, claims to have 400 million monthly active users. WhatsApp's CEO, Jan Koum revealed the news, and also noted that the company added 100 million active users in the last four months alone. Further, the company claimed to reach the 400 million mark without spending a penny on targeted ads or even marketing campaigns.
short by Durga Ranjan /
04:40 am on 21 Dec
