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Three tech stocks — Snap Inc., Roku and Facebook — posted especially strong gains as broader markets staged a more modest rally to close the week on a high note. A stellar earnings report after the close of trading on Thursday propelled Snap up 24% to a new record high of $77.97. Trading volume was more than five…

UPDATED with market close: Stocks plunged Friday as the market posted its worst week since March. The Dow Jones Industrial Average fell 157 points, or 0.59%, but the S&P 500 and the tech-heavy Nasdaq were lower, respectively, by 1.21% and a hefty 2.45%. Tech dragged shares lower, with Twitter the biggest loser, ended…