The Quiet Upheaval of Facebook's New iPhone App

This week, Facebook will have two big causes for celebration. On Monday, the company will release a new iPhone app. On Tuesday, it will turn 10.A new iPhone app? New software would seem to pale against a decade of existence—ten years in which the company has gone from a dorm room conception to a $150 billion capitalization, in which a website that once required harvard.edu email addresses became the world’s second most-visited.