9. -- Facebook ( FB) said a bug in its system caused contact information for 6 million users to be inadvertently exposed. The social media giant said a bug allowed users' contact information, like email addresses or phone numbers, to be accessed by other users who either had some contact information about that person or some connection to them. Facebook said that the problem was tied to its "Download Your Information" tool. 10. -- Walt Disney's ( DIS) Monsters University was the weekend box-office winner, according to studio estimates. The film debuted in first place with $82 million, beating out World War Z and Man of Steel. -- Written by Joseph Woelfel >To contact the writer of this article, click here: Joseph Woelfel >To submit a news tip, send an email to: email@example.com.