Stocks mixed ahead of housing report U.S. stocks opened mixed ahead of a report expected to signal further gains in the housing market, while Facebook's shares took another fall. Minutes after the opening bell, the Dow Jones industrial average is up 8 points to 12,510. The Standard & Poor's 500 index is up 2 points to 1,316. But the Nasdaq composite index is down 2 points to 2,844. Facebook Inc. shares kept sliding, dropping 8 percent in early trading. The social networking company's stock has fizzled since its long-awaited debut on Friday. Its stock lost 11 percent on Monday, even as the rest of the stock market rallied. Later this morning, the National Association of Realtors is expected to report that sales of previously owned homes increased in April after falling in March.