I have been using whats app since last 3 years and whatsapp is a very well known social networking app this is being used worldwide. this app is based on avery simple concept and it is very simple to use even a child can handle it. we sahre contacts, share videos, share documents, share images, even we can call our friends and family members who are connected to this app. even we can have video call with all those who are on whats app.