1. WhatsApp.
WhatsApp is the most preferred communication app in the world today, the continent where this application is most used is in Europe with more than 25 million users.
2. HipChat.
It is the second most used communication app in the world, mostly in the Asian continent with more than 23 million users.
3. SnapChat.
It is the third most used communication app in the world, this app is mostly used in USA and in Europe with less importance than WhatsApp. This app has 20 million of users.
Rincón Bruno y Dani 