Wall St. opens higher; Facebook limits gains on Nasdaq

Facebook fell 4 percent to $122.25, a day after the social media giant warned that revenue growth would slow this quarter. The S&P 500 ended lower on Wednesday for a seventh straight session, its longest such streak in five years, as the Federal Reserve signaled it could hike interest rates in December and the uncertainty surrounding the U.S. election. The U.S. central bank held interest rates steady, but said the economy had gained steam and job gains remained solid.