I think Viber is getting better and better. I have noticed that Viber is more popular in East Europe and What’s up in US and West EU. I think that Viber is much better in terms of security than What’s up.
But for me Telegram is also a big player in this game.
Very good post! Congrats !
Oh yeah, Telegram is a different thing altogether. People can even do games in it. haha. Thanks for dropping by!