SAN FRANCISCO (Reuters) - Facebook Inc has inadvertently exposed 6 million users' phone numbers and email addresses to unauthorized viewers over the past year, the world's largest social networking company disclosed late Friday. Facebook blamed the data leaks, which began in 2012, on a technical glitch in its massive archive of contact information collected from its 1.1 billion users worldwide. As a result of the glitch, Facebook users who downloaded contact data for their list of friends obtained additional information that they were not supposed to have. Facebook's security team was alerted to the bug last week and fixed it...