The Home tab is the center piece of the new QuizUp. Where you see a feed of stories from people and topics you follow. What you will see there for example is when a friend changes his profile picture and a post from another friends which likes the same topic as you do.
This news feed shows you what is happening around you, delivers a constant feed of new and hot stories from friends and topics that you are following. You can see the numbers of likes, comments and the time when this story was posted.