In this modern Age, I don't think that we're as young generation of india unaware about most popular messaging app called whatsapp.You may thinkHey bro !What a silly question you are asking about, of course we know that, don't just know we are master in this by chatting over it all times with friends and family.Sorry for that, I know we all are using it everyday and wasting our time?, maybe you are using it very smartly than me. I'm assuming that you are using it productively.MARK MY WORDS "PRODUCTIVE USE"Cause I came across to some children at the age