Shareit is an well known app for sharing anything in smartphones I am using this from 2014. by this we can share any type of files to our friends in very fast securely. I think there is no other app like shareit. we can share large size of files with in just minutes same file we transfer through the blutooth or other app it may take time. shareit has millions of user but they did not showing any advertisments. we can use it for free I will prefer this for share anything. this is an advanced technology to share files. I think the people who are using android all are have shareit so I did not prefer to you. anyway just they have to develop some features to chat with friends in surrounding area like classroom so we can interact with very easy and free.