The Facebook Effect

IN LITTLE MORE THAN HALF A DECADE, Facebook has gone from a dorm-room novelty to a company with 500 million users. It is one of the fastest growing companies in history, an essential part of the social life not only of teenagers but hundreds of millions of adults worldwide. As Facebook spreads around the globe, it creates surprising effects—even becoming instrumental in political protests from Colombia to Iran. Veteran technology reporter David Kirkpatrick had the full cooperation of Facebook