Why is sharing useful? Games are, by their nature, social. Perhaps you are starting to play a game of Ultimate Zombie Battles and you want to let your friends know you are playing so they can come join you. You may want to let the world know that you just achieved a personal high score on Find the Chicken. Or better yet, you just downloaded a new game and you think it is so cool, you want to let your friend and family know about it so they can play it too.