WhatsApp May be bigger than Twitter

According to industry estimates, WhatsApp has become bigger than Twitter in terms of monthly active users. The Wall Street Journal says that WhatsApp has more than 250 million monthly active users whereas Twitter has around 200 million monthly active users in December 2013. It is fast approaching the popular video-chat service Skype which has around 280 million monthly active users.
The figure is impressive for a company that launched its app just four years ago and that spends no money marketing itself. It makes WhatsApp one of the largest messaging platforms.
WhatsApp’s growth is of concern to many telecom carriers that make huge profits billing for text messages.