Broadcasting is the sharing of information to a large audience (social networks) while narrow casting is sharing of information to a select group (SMS/MMS).
When information is sent through a narrow cast, the chances of all the messages being viewed is a lot more than in a broadcast. The use of a narrow cast application is 2 times more than a social network site. That is 6.4 billion users use narrow cast in 24 hours as against 3.2 billion broadcast users.
Users of mobile devices look at them 150 times everyday and hence cannot miss your message. Only 60% users of FB login everyday. Thus narrow casting allows you to share your message to the targeted audience without shooting all over the place.
