Facebook CEO Mark Zuckerberg's status update yesterday was about how the site had passed 1 billion active users a month, the Washington Post reported, and Business Week has an interview with Facebook CEO Mark Zuckerberg about his service's "next billion." In it, after the question "How big are Facebook’s ambitions in areas like health care, finance, and government?", Zuckerberg makes an … [Read more...] about Facebook passes the 1 billion mark