You probably know more about the day to day experiences of that weirdo you barely remember from junior high than people with whom you have an active friendship. In related news, Facebook is 15. Julie Beck in The Atlantic: “The social network is 15 years old this Monday, and in taking stock of the effects of its decade and a half of existence on people’s social lives, this is what stands out the most: Facebook is where friendships go to never quite die.” (But privacy does…)

+ ReCode: From dorm room to global dominance, Facebook’s path to 2.3 billion users.