We all use whatsapp over many other apps from the plethora of apps to choose from like wechat, hangout, viber, xing and so on and soforth. Since mark zuckerberg ( sound like name of some icecream) bought it there are few changes in the app nodoubt. Looks like copied from other apps and improvised a bit and then added to this app. Unlike chinese people, they dont create technology but always see whats happening around and then will goto iphone store but never buy an iphone instead will take pictures of the phone and send it back to china make 10000000 copies of it which will be same to same and then start using it under the disguise of iphone. Thats whTsapp for me.