I am sunil kumar mahato and I am saying about whats App. It is the best application for the chat in the world. In whats app there are many option for chat . for example- you can send a image, video, documents , contacts in few sec. You can also send your loacation .Initially when whats App came in the market on that time call was not possible but now you can do call also. You can create a group and add your all friends and then share video , image and other document in few sec to all friends . personally I am using since 2012. I recommended to install this app.
Thanks