Wall Street has an up day as the S&P 500 rises 1.7%
                                
                                
                                    (Newser) -
                                    Stocks posted solid gains on Wall Street Wednesday, erasing their losses from a day earlier. Big-name investor favorites like Facebook, Apple, and Amazon helped pull the market higher,  the AP  reports. The S&P 500 rose 1.7%. Technology, the only sector that's holding on to a gain for...