Stocks are closing mostly higher as investors work through an uneven batch of corporate earnings, the AP reports. Facebook added 1% Thursday after the social media company reported earnings that easily surpassed analysts' estimates. Ford sank 8% after reporting weak results and warning investors that things could get worse in the second half of the year. Oil and gas companies were broadly lower as energy prices continued to fall. The Dow Jones industrial average fell 15 points, or 0.1%, to 18,456. The Standard & Poor's 500 index edged up 3 points, or 0.2%, to 2,170. The Nasdaq composite gained 15 points, or 0.3%, to 5,154. (More Dow Jones stories.)