Youngsters are avoiding Facebook—but not the firm’s other platforms

IN 2003 MARK ZUCKERBERG built Facemash.com, a website ranking the attractiveness of his Harvard classmates. The college made him delete it. But the 19-year-old soon launched another site, on which users could create profiles and communicate. TheFacebook.com spread rapidly to other campuses. By 2006, when The Economist first wrote a story about the “student networking site”, it had 10m users.