Facebook : It is the best app ever. This app is downloaded by millions of people.In this app we can make many friends, we can upload profile, cover photo and so on.We can also like others pictures, posts, and also comment on others posts. Through this app we can also chat. We can see many prank and funny videos uploaded by our friends. In this app we can make many groups, pages etc.In this app we can tagged our friends. while uploading images and alao tagged on others posts. This app is most popular allover the world.