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U.S. stock-index benchmarks on Thursday jumped to records at the open, supported by the latest round of upbeat corporate results. Most recently Facebook Inc. FB, +5.30% reported second-quarter results late-Wednesday that beat expectations, helping it approach a market value of $500 million. Enthusiasm around Facebook helped to lift the broader technology industry XLK, +0.66% The Dow Jones Industrial Average DJIA, +0.23% rose to an all-time intraday high and was most recently up 0.2% at 21,763, the S&P 500 index SPX, +0.06% climbed 0.2% at 2,481, while the tech-laden Nasdaq Composite Index COMP, +0.34% rose 0.5% at 6,453. Separately, Twitter Inc. TWTR, -11.47% shares were plunging after it reported lackluster user growth in its recent quarterly report. Shares of the microblogging platform were down about 13%.