Whatsapp being a simple messenger app by facebook is an excellent app for simple conversation chatting exchanging images documents etc. The only problem is decreasing the file quality and size. But it is necessory for fast exchanges. The app is very usefull. We can write or share our emotions via letters, images, voice records etc. The interface is very simple and easy to use. Latest versions have audio video callling also. Facebook gives a good effort to keep the app loved by people. Moreover it is lifetime free and add free. Love whatsapp!