Facebook reaches one billion friends


Are you on Facebook? That makes you one in a billion. {}The world's largest social network announced Thursday morning it has exceeded one billion users. {}That means about one out of every seven people on the planet has a Facebook account.It took Facebook six years to reach the 500,000,000 user mark, and less than two years to double that. {}Most of the newer users live outside North America, where growth has leveled off. {}The next big potential target for Facebook: China, which blocks the site from its citizens. {}Facebook's most recent investor report said the company continues to evaluate ways to enter China. {}