The first time Whatsapp came out, most of friends use it. But overtime, Whatsapp is just another type of social media as Viber. And I use Viber more than Whatsapp until days later I stop using Whatsapp. I like Viber than any other, it is more easy to use and, I like the theme color of Viber.
I don't really get or there is no connection for me with Whatsapp. It's like no chemistry to use it. I'd rather use Viber with the same function like calling, group chat, and video call just like Skype, too.
The Whatsapp is not a hit for everyone especially where I live. There are too many social app nowadays and Facebook Messenger is commonly used between my family and friends for contact. So, I don't really need lots of social media accounts, one is enough.