TIE UP with Facebook we cant compromize our secruity because whatsapp share our personal mobile number and contacts with facebook.Whatsapp provide end to end enctiption no one can read our personal messages thats good but some time ago whatsapp share oue contact to fb when fb take over whatsapp.then consider secruity issue WhatsApp decide to ask every user for sharing information.but by mistake we ok than we cant secure becus fb friends add by whatsapp contacts.
Major merit of WhatsApo is we can receive message on screen like our sim messages so we can miss any chit chat msgs.
Whatsapp is nive concept to connect with friend through soical with or without internet nicely designed.i loving it
I like green colour of whatsapp its a theme of it I like symbol of whatsApp and asm designed by developers.
Calling Feature is one of the biggest advantage of Whatsapp we can call by using Internet data.
Vidwo call I think prime feature I m waiting still.some improvement needs in update version just available in beta version.
Very useful for youth becus they can easily touch with college/school/coaching/office friends.for every generation WhatsApp is like fountain of youth.