What do you mean " need "? You don't need to live in a house , cave is good enough to live . But house make you feel more comfortable , FB save you money to communicate you friends and family , FaceTime make that even better , you can see them, and free !! You can express your motions through it , Say something you want to say.and meet new friends , it's again free ! And because more then 1 billion of users , now they can do lots other service , like shopping on FB GIFT and much more. I am a believer , they going to change the world and make it better , of course , they will find the way(s) to reward themself and investors, they deserve it , and we deserve it !!!