In earnings-related moves, Baidu Inc's BIDU.O U.S. shares fell 3.7% even after the company posted upbeat quarterly revenue. By Herbert Lash and Devik Jain Aug 12 (Reuters) - The S&P 500 notched its third straight record high on Thursday, with mega-cap technology stocks taking charge, as investors mulled data showing a steady U.S. jobs market recovery against a backdrop of potentially inflationary producer prices. Traders snapped up shares that had missed out on the overall market marching higher the past week, according to Tim Ghriskey, chief investment strategist at Inverness Counsel.