First Solar (FSLR) and Goodyear Tire & Rubber (GT) plunged Friday, as the S&P 500 posted its third weekly loss in five weeks. SPDR S&P 500 (SPY) fell 0.58% to $145.85. It's shed 0.86% for the week. PowerShares QQQ (QQQ), tracking the 100 largest nonfinancial stocks on the Nasdaq, up 0.14%, hung on to a 12-year high. SPDR Dow Jones Industrial Average (DIA), down 0.13%, held near a five-year high. IShares Dow Jones Transportation Average (IYT), off