ADMIT IT. You are always checking your Facebook newsfeed, whether on the office computer at work or on the app on your phone. Yes, you are OBSESSED! But why have we all become so engrossed in something so monstrous and so superficial?
So Facebook keeps your attention (and thus its ad revenues) by offering you the ability to quietly and surreptitiously spy on those around you. It has little to do with caring and sharing, despite their marketing bumpf.