Whats up is an app that is mostly used messaging in app in india than other countries . past few years ago its just a messaging app and its going on updating like shaing images and videos aand after owning it by the facebook it bounces up and updated to voice calling and video calling to and the life changes of it . and this is moving step forword to sstore the messages in gmail and also can backup in drives to in encryption method . the voice call and video call limits are not acceptable rules by the government of india its so its making the terrorists to comunicate through it without knowing the details of them . so whats up should permit their limits . its useful to share the information easing to any one in the world privately and groups too and its resently increases the group limit from 50 to 256 and the limit of file is only 16 mb then we cant share some type of files through it .if it improves it .then it will be soo good .and many rumors are coming like its selling our presonal data etc and I dont know it true are not. and many are mis using it too